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Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2013 shares
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Trading Symbol	HES
Entity Registrant Name	HESS CORP
Entity Central Index Key	0000004447
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	343,297,818

CONSOLIDATED BALANCE SHEET - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 444	$ 642
Accounts receivable
Trade	1,567	4,057
Other	273	281
Inventories	686	1,259
Assets held for sale	7,545	1,092
Other current assets	903	1,056
Total current assets	11,418	8,387
INVESTMENTS IN AFFILIATES	337	443
PROPERTY, PLANT AND EQUIPMENT
Total - at cost	40,255	45,553
Less: Reserves for depreciation, depletion, amortization and lease impairment	14,604	16,746
Property, plant and equipment - net	25,651	28,807
GOODWILL	1,869	2,208
DEFERRED INCOME TAXES	2,742	3,126
OTHER ASSETS	362	470
TOTAL ASSETS	42,379	43,441
CURRENT LIABILITIES
Accounts payable	571	2,809
Accrued liabilities	2,616	3,287
Taxes payable	751	960
Liabilities associated with assets held for sale	3,064	539
Short-term debt and current maturities of long-term debt	1,904	787
Total current liabilities	8,906	8,382
LONG-TERM DEBT	5,472	7,324
DEFERRED INCOME TAXES	2,210	2,662
ASSET RETIREMENT OBLIGATIONS	1,994	2,212
OTHER LIABILITIES AND DEFERRED CREDITS	1,272	1,658
Total liabilities	19,854	22,238
Hess Corporation Stockholders' Equity
Common stock, par value $1.00 Authorized - 600,000,000 shares Issued - 343,297,818 shares at March 31, 2013; 341,527,617 shares at December 31, 2012	343	342
Capital in excess of par value	3,569	3,524
Retained earnings	18,958	17,717
Accumulated other comprehensive income (loss)	(452)	(493)
Total Hess Corporation stockholders' equity	22,418	21,090
Noncontrolling interests	107	113
Total equity	22,525	21,203
TOTAL LIABILITIES AND EQUITY	$ 42,379	$ 43,441

CONSOLIDATED BALANCE SHEET (Parenthetical) - $ / shares	Mar. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	600,000,000	600,000,000
Common stock, shares issued	343,297,818	341,527,617

STATEMENT OF CONSOLIDATED INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
REVENUES AND NON-OPERATING INCOME
Sales and other operating revenues	$ 3,466	$ 2,896
Gains on asset sales	688	36
Other, net	(37)	29
Total revenues and non-operating income	4,117	2,961
COSTS AND EXPENSES
Cost of products sold (excluding items shown separately below)	596	270
Operating costs and expenses	585	535
Production and severance taxes	130	138
Exploration expenses, including dry holes and lease impairment	219	253
General and administrative expenses	149	132
Interest expense	106	104
Depreciation, depletion and amortization	679	662
Total costs and expenses	2,464	2,094
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	1,653	867
Provision for income taxes	470	328
INCOME FROM CONTINUING OPERATIONS	1,183	539
Income from discontinued operations, net of income taxes	90	21
NET INCOME	1,273	560
Less: Net income (loss) attributable to noncontrolling interests	(3)	15
NET INCOME ATTRIBUTABLE TO HESS CORPORATION	$ 1,276	$ 545
NET INCOME ATTRIBUTABLE TO HESS CORPORATION PER SHARE BASIC:
Continuing operations	$ 3.47	$ 1.58
Discontinued operations	0.29	0.03
NET INCOME PER SHARE	3.76	1.61
DILUTED:
Continuing operations	3.43	1.57
Discontinued operations	0.29	0.03
NET INCOME PER SHARE	$ 3.72	$ 1.60
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING (DILUTED)	342.6	340.3
COMMON STOCK DIVIDENDS PER SHARE	$ 0.10	$ 0.10

STATEMENT OF CONSOLIDATED COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,273	$ 560
Derivatives designated as cash flow hedges
Effect of hedge losses reclassified to income	4	154
Income taxes on effect of hedge losses reclassified to income	(2)	(57)
Net effect of hedge losses reclassified to income	2	97
Change in fair value of cash flow hedges	18	(479)
Income taxes on change in fair value of cash flow hedges	(7)	187
Net change in fair value of cash flow hedges	11	(292)
Change in derivatives designated as cash flow hedges, after-tax	13	(195)
Pension and other postretirement plans
Actuarial gains (losses) in plan liabilities	245
Income taxes on actuarial changes in plan liabilities	(89)
Net effect of actuarial gains (losses) in plan liabilities	156
Amortization of net actuarial losses	22	21
Income taxes on amortization of net actuarial losses	(8)	(8)
Net effect of amortization of net actuarial losses	14	13
Change in pension and other postretirement plans, after-tax	170	13
Foreign currency translation adjustment
Foreign currency translation adjustment	(169)	196
Reclassified to Gains on asset sales	25
Change in foreign currency translation adjustment	(144)	196
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	39	14
COMPREHENSIVE INCOME	1,312	574
Less: Comprehensive income (loss) attributable to noncontrolling interests	(5)	19
COMPREHENSIVE INCOME ATTRIBUTABLE TO HESS CORPORATION	$ 1,317	$ 555

STATEMENT OF CONSOLIDATED CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,273	$ 560
Adjustments to reconcile net income to net cash provided by operating activities
Gains on asset sales	(688)	(36)
Depreciation, depletion and amortization	679	662
Exploratory dry hole costs	30	88
Lease impairment	79	57
Stock compensation expense	12	13
Provision (benefit) for deferred income taxes	141	(143)
Income from discontinued operations	(90)	(21)
Changes in operating assets and liabilities	(650)	(213)
Cash provided by operating activities - continuing operations	786	967
Cash provided by operating activities - discontinued operations	33	21
Net cash provided by operating activities	819	988
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,509)	(1,856)
Proceeds from asset sales	1,326	132
Other, net	(66)	(26)
Cash used in investing activities - continuing operations	(249)	(1,750)
Cash used in investing activities - discontinued operations	(12)	(22)
Net cash used in investing activities	(261)	(1,772)
CASH FLOWS FROM FINANCING ACTIVITIES
Net borrowings (repayments) of debt with maturities of 90 days or less	(913)	581
Debt with maturities of greater than 90 days
Borrowings	185	390
Repayments	(24)	(82)
Cash dividends paid	(35)	(68)
Other, net	31	8
Cash provided by (used in) financing activities - continuing operations	(756)	829
Cash provided by (used in) financing activities - discontinued operations
Net cash provided by (used in) financing activities	(756)	829
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(198)	45
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	642	351
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 444	$ 396

STATEMENT OF CONSOLIDATED EQUITY - USD ($) $ in Millions	Total	Common Stock [Member]	Capital in Excess of Par [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Hess Stockholders' Equity [Member]	Noncontrolling Interests [Member]
Beginning balance at Dec. 31, 2011	$ 18,592	$ 340	$ 3,417	$ 15,826	$ (1,067)	$ 18,516	$ 76
Net income	560			545		545	15
Other comprehensive income (loss)	14				10	10	4
Comprehensive income (loss)	574					555	19
Restricted common stock awards, net	9	2	7			9
Employee stock options, including income tax benefits	17		17			17
Cash dividends declared	(34)			(34)		(34)
Noncontrolling interests, net	(1)						(1)
Ending balance at Mar. 31, 2012	19,157	342	3,441	16,337	(1,057)	19,063	94
Beginning balance at Dec. 31, 2012	21,203	342	3,524	17,717	(493)	21,090	113
Net income	1,273			1,276		1,276	(3)
Other comprehensive income (loss)	39				41	41	(2)
Comprehensive income (loss)	1,312					1,317	(5)
Restricted common stock awards, net	9	1	8			9
Employee stock options, including income tax benefits	33		33			33
Performance share units	4		4			4
Cash dividends declared	(35)			(35)		(35)
Noncontrolling interests, net	(1)						(1)
Ending balance at Mar. 31, 2013	$ 22,525	$ 343	$ 3,569	$ 18,958	$ (452)	$ 22,418	$ 107

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References + Details

Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2013
Accounting Policies [Abstract]
Basis of Presentation	1. Basis of Presentation The financial statements included in this report reflect all normal and recurring adjustments which, in the opinion of management, are necessary for a fair presentation of Hess Corporation’s (the Corporation or Hess) consolidated financial position at March 31, 2013 and December 31, 2012 and the consolidated results of operations and cash flows for the three month periods ended March 31, 2013 and 2012. The unaudited results of operations for the interim periods reported are not necessarily indicative of results to be expected for the full year. In March 2013, the Corporation announced an asset sales program that includes divesting its downstream businesses and oil and gas properties in Indonesia and Thailand to continue its transformation into a more focused pure play exploration and production (E&P) company. The downstream businesses to be divested include its terminal, retail, energy marketing and energy trading operations. The Corporation has initiated a sales process for each of the assets in the program and anticipates completing the divestitures within one year. In February 2013, the Corporation ceased refining at its Port Reading facility, completing its exit from all refining operations. The results of the terminal, retail, energy marketing, energy trading and Port Reading refining operations (the “downstream businesses”) have been classified as discontinued operations for all periods presented. See Note 2, Discontinued Operations. Unless indicated otherwise, the information in the notes to the Consolidated Financial Statements relates to the Corporation’s continuing operations. The financial statements were prepared in accordance with the requirements of the Securities and Exchange Commission (SEC) for interim reporting. As permitted under those rules, certain notes or other financial information that are normally required by U.S. generally accepted accounting principles (GAAP) have been condensed or omitted from these interim financial statements. These statements, therefore, should be read in conjunction with the consolidated financial statements and related notes included in the Corporation’s Form 10-K for the year ended December 31, 2012. Certain information in the financial statements and notes has been reclassified to conform to the current period presentation. *Recently adopted accounting pronouncements:* Effective January 1, 2013, the Corporation adopted ASU 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (AOCI) which requires aggregated disclosures of amounts reclassified out of AOCI as well as a presentation of changes in AOCI balances by component. The changes in AOCI by component, including amounts reclassified out of AOCI in their entirety are presented in the Statement of Consolidated Comprehensive Income. Effective January 1, 2013, the Corporation adopted ASU 2011-11, Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities which requires disclosure of information needed to evaluate the effects or potential effects of the contractual right of setoff for assets and liabilities. This accounting standard update applies to assets and liabilities related to financial instruments and derivatives subject to an enforceable master netting arrangement or similar agreement. The required disclosures are presented in Note 13, Risk Management and Trading Activities.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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+ Details

Discontinued Operations

3 Months Ended

Mar. 31, 2013

Discontinued Operations And Disposal Groups [Abstract]

Discontinued Operations

2. Discontinued Operations

As a result of the Corporation’s plans to divest its downstream businesses, the results of operations for these businesses have been reported as discontinued operations in the Statement of Consolidated Income and the related assets and liabilities have been classified as held for sale at March 31, 2013 in the Consolidated Balance Sheet. The downstream businesses were previously included in the reported Marketing and Refining segment.

Sales and other operating revenues and income from discontinued operations for the downstream businesses were as follows:


	Three Months Ended March 31,
	2013			2012
	(In millions)
Sales and other operating revenues	$	7,413		$	6,800

Income from discontinued operations before income taxes	$	144		$	30
Provision for income taxes		54			9

Income from discontinued operations, net of income taxes		90			21
Less: Net income (loss) attributable to noncontrolling interests		(10	)		9

Net income from discontinued operations attributable to Hess Corporation	$	100		$	12

The following table presents the assets and liabilities of the discontinued downstream businesses that are classified as held for sale (in millions):


	March 31,
	2013
Accounts receivable	$	2,888
Inventories		457
Investment in affiliates		173
Property, plant and equipment, net		1,130
Other assets		145

Total assets	$	4,793


Accounts payable and accrued liabilities	$	2,467
Other liabilities and deferred credits		143

Total liabilities	$	2,610

The inventories of the downstream businesses consisted of $1,200 million of refined petroleum products and natural gas, less a last-in, first out (LIFO) adjustment of $851 million, and $108 million of merchandise.

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

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+ Details

Exit and Disposal Costs

3 Months Ended

Mar. 31, 2013

Restructuring And Related Activities [Abstract]

Exit and Disposal Costs

3. Exit and Disposal Costs

The following table provides the components of and changes in the Corporation’s restructuring accruals:


	E&P		Corporate and Other		Discontinued Operations (a)			Total
	(In millions)
Employee Severance
Balance at beginning of period	$	—	$	—	$	—		$	—
Provision		71		18		69			158	(b)
Payments		—		—		—			—

Balance at March 31, 2013		71		18		69			158

Facility Exit Costs
Balance at beginning of period		—		—		—			—
Provision		—		—		21			21	(c)
Payments		—		—		(2	)		(2	)

Balance at March 31, 2013		—		—		19			19


Total restructuring accruals at March 31, 2013	$	71	$	18	$	88		$	177

(a)

Comprises the downstream businesses.

(b)

Of the total employee severance charges, $34 million was included in Operating costs and expenses, $14 million in Exploration expenses, $41 million in General and administrative expenses and $69 million in Income from discontinued operations.

(c)

Included in Income from discontinued operations.

The employee severance charges resulted primarily from the Corporation’s asset sales program announced in March 2013, that was initiated to continue the transformation to a more focused pure play E&P company, and were based on probable amounts incurred under ongoing severance arrangements or other statutory requirements, plus amounts earned through March 31, 2013 under enhanced benefit arrangements. The Corporation expects to incur additional enhanced benefit charges of approximately $115 million beyond the amounts accrued at March 31, 2013, of which $21 million relates to E&P, $26 million to Corporate and Other and $68 million to discontinued operations. These additional enhanced benefit charges will be recognized ratably over the estimated future service period. The Corporation’s estimate of employee severance costs could change due to a number of factors, including the number of employees that work through the requisite service date and the timing of when each divestiture occurs. The facility exit costs relate to the shutdown of the Port Reading refining operations in February 2013. In order to complete this shutdown, the Corporation expects to incur approximately $40 million of additional costs beyond the amounts accrued at March 31, 2013, principally costs to idle the refinery equipment.

In the first quarter of 2013, the Corporation also recorded $80 million of additional depreciation after reducing the estimated useful life for the Port Reading refining facility due to its decision to cease refining operations. The additional depreciation is included in Income from discontinued operations.

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References + Details

Dispositions	3 Months Ended
Dispositions	Mar. 31, 2013
Business Combinations [Abstract]
Dispositions	4. Dispositions In March 2013, the Corporation sold its interests in the Azeri-Chirag-Guneshli (ACG) fields (Hess 3%), offshore Azerbaijan in the Caspian Sea, and the associated Baku-Tbilisi-Ceyhan (BTC) oil transportation pipeline company (Hess 2%) for cash proceeds of $884 million. The transaction resulted in an after-tax gain of $360 million, after deducting the net book value of assets including allocated goodwill of $52 million. In January 2013, the Corporation completed the sale of its interests in the Beryl fields and the Scottish Area Gas Evacuation System (SAGE) in the United Kingdom North Sea for cash proceeds of $442 million. The transaction resulted in an after-tax gain of $323 million, after deducting the net book value of assets including allocated goodwill of $48 million. In January 2012, the Corporation completed the sale of its interest in the Snohvit Field (Hess 3%), a liquefied natural gas project offshore Norway, for cash proceeds of $132 million. The transaction resulted in an after-tax gain of $36 million, after deducting the net book value of assets including allocated goodwill of $14 million.

Inventories

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Inventories

5. Inventories

Inventories consisted of the following:


	March 31, 2013		December 31, 2012
	(In millions)
Crude oil and other charge stocks	$	284	$	493
Refined petroleum products and natural gas		—		1,362
Less: LIFO		—		(1,123	)

		284		732
Merchandise, materials and supplies		402		527

Total inventories	$	686	$	1,259

In the first quarter of 2013, the Corporation recognized a gain of $218 million ($137 million after income taxes) in Income from discontinued operations relating to the liquidation of LIFO inventories following the cessation of refining operations at the Port Reading facility. The inventories of the downstream businesses have been classified as Assets held for sale at March 31, 2013.

Property, Plant and Equipment

3 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Property, Plant and Equipment

6. Property, Plant and Equipment

Assets Held for Sale

Exploration and Production: In March 2013, the Corporation reached agreements to sell its assets in the Eagle Ford Shale in Texas for $265 million and its Russian subsidiary, Samara-Nafta. In March, the Corporation also approved a plan to divest its assets in Thailand (principally comprising Pailin (Hess 15%) and Sinphuhorm (Hess 35%)) and in Indonesia (principally comprising Pangkah (Hess 75%) and Natuna (Hess 23%)). In April 2013, the Corporation completed the sale of 100% of Samara-Nafta for $2.05 billion and received net after-tax proceeds of approximately $1.9 billion after working capital and other adjustments for its 90% interest. See Note 14, Subsequent Events. At March 31, 2013, the Corporation classified as held for sale its oil and gas assets in Russia, Indonesia, Thailand and the Eagle Ford Shale in Texas. At March 31, 2013, E&P assets totaling $2,752 million, primarily comprising the net property, plant and equipment balances and allocated goodwill of $339 million, were classified as Assets held for sale. In addition, liabilities, primarily comprising asset retirement obligations and deferred income taxes totaling $454 million, were reported in Liabilities associated with assets held for sale. At December 31, 2012, long-term assets totaling $1,092 million, primarily comprising the net property, plant and equipment balances and allocated goodwill of $100 million, were classified as held for sale and reported in Other current assets. In addition, related asset retirement obligations and deferred income taxes totaling $539 million were reported in Liabilities associated with assets held for sale.

Downstream Businesses: As of March 31, 2013, the assets and liabilities of the downstream businesses have been classified as held for sale. See Note 2, Discontinued Operations.

Capitalized Exploratory Well Costs: The following table discloses the net changes in capitalized exploratory well costs pending determination of proved reserves for the three months ended March 31, 2013 (in millions):


Balance at January 1	$	2,259
Additions to capitalized exploratory well costs pending the determination of proved reserves		100
Reclassifications to wells, facilities and equipment based on the determination of proved reserves		(4	)
Capitalized exploratory well costs charged to expense		(2	)
Dispositions		(78	)

Balance at end of period	$	2,275

The preceding table excludes exploratory dry hole costs of $28 million which were incurred and subsequently expensed in 2013. Capitalized exploratory well costs greater than one year old after completion of drilling were $1,771 million at March 31, 2013. Approximately 37% of the capitalized well costs in excess of one year related to Block WA-390-P, offshore Western Australia, where development planning and commercial activities, including negotiations with potential liquefaction partners, are ongoing. Successful negotiation with a third party liquefaction partner is necessary before the Corporation can negotiate a gas sales agreement and sanction development of the project. Approximately 37% related to the Corporation’s Pony discovery on Block 468 in the deepwater Gulf of Mexico. In the third quarter of 2012, the Corporation signed an exchange agreement with partners of the adjacent Green Canyon Block 512, which contains the Knotty Head discovery. Under this agreement covering Blocks 468 and 512, Hess was appointed operator and has a 20% working interest in the blocks, now collectively referred to as Stampede. Field development planning is progressing and the project is targeted for sanction in 2014. Approximately 15% related to Area 54, offshore Libya, where force majeure was withdrawn in March 2012 following civil unrest and the Corporation is pursuing commercial options. Approximately 7% related to offshore Ghana where the Corporation completed drilling its seventh consecutive successful exploration well in February 2013. Discussions regarding the appraisal plan for the block are ongoing with the Ghanaian government. In parallel, the Corporation has begun pre-development studies on the block. The remainder of the capitalized well costs in excess of one year related to projects where further drilling is planned or development planning and other assessment activities are ongoing to determine the economic and operating viability of the projects.

Goodwill

3 Months Ended

Mar. 31, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill

7.	Goodwill

The changes in the carrying amount of goodwill, all of which relate to the E&P segment, are as follows (in millions):


	March 31, 2013
Balance at beginning of period	$	2,208
Reclassified to Assets held for sale		(339	)

Balance at end of period	$	1,869

Debt

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Debt

Debt

In the first quarter of 2013, the Corporation repaid a net amount of $728 million under available credit facilities, which consisted of net repayments of $713 million on its syndicated revolving credit facility and $200 million on the Corporation’s short-term credit facilities, partially offset by borrowings of $185 million from its asset-backed credit facility. In addition, the Corporation repaid $24 million of other debt. At March 31, 2013, the Corporation classified as short-term $1,620 million of borrowings under its available credit facilities, based on its intent to repay these amounts using expected proceeds from its announced or agreed asset sales. See Note 14, Subsequent Events.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Foreign Currency

3 Months Ended

Mar. 31, 2013

Foreign Currency [Abstract]

Foreign Currency

9.	Foreign Currency

Pre-tax foreign currency gains (losses) included in Other, net in the Statement of Consolidated Income amounted to the following:


	Three Months Ended March 31,
	2013			2012
	(In millions)
Pre-tax foreign currency gains (losses)	$	(31	)	$	21

- Definition

The entire disclosure for foreign currency transactions and translation. This may include description of foreign currency transactions, foreign currency gains and losses, explanation of change in cumulative translation adjustment, description of effect of subsequent foreign currency exchange rate change, cumulative translation adjustment movement, foreign currency translation adjustment by component movement, translation adjustment for net investment hedge movement, adjustment for long-term intercompany transactions, schedule of long-term intercompany balances and any other foreign currency transactions and translation related items.

+ References

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+ Details

Retirement Plans

3 Months Ended

Mar. 31, 2013

Compensation And Retirement Disclosure [Abstract]

Retirement Plans

10. Retirement Plans

Components of net periodic pension cost consisted of the following:


	Three Months Ended
	March 31,
	2013			2012
	(In millions)
Service cost	$	20		$	18
Interest cost		22			22
Expected return on plan assets		(33	)		(29	)
Amortization of net loss		21			21

Pension expense	$	30		$	32

During the first quarter of 2013, the Corporation’s pension and other postretirement plans were impacted by a significant reduction in the expected future service from active participants due to the Corporation’s announced asset sales program initiated to continue the transformation to a more focused pure play E&P company. The impact of the resulting curtailment and remeasurement was a reduction of approximately $245 million in the Corporation’s accrued benefit plan liabilities and pre-tax unrecognized actuarial losses recorded in Accumulated other comprehensive income (loss). As a result, the Corporation’s full year 2013 pension expense is now estimated to be approximately $80 million, of which approximately $60 million relates to the amortization of unrecognized net actuarial losses.

In 2013, the Corporation expects to contribute approximately $140 million to its funded pension plans. Through March 31, 2013, the Corporation contributed $40 million of this amount.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Weighted Average Common Shares

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Weighted Average Common Shares

11. Weighted Average Common Shares

The net income and weighted average number of common shares used in the basic and diluted earnings per share computations were as follows:


	Three Months Ended
	March 31,
	2013			2012
	(In millions, except per share amounts)
Income from continuing operations, net of income taxes	$	1,183		$	539
Less: Net income (loss) attributable to noncontrolling interests		7			6

Net income from continuing operations attributable to Hess Corporation		1,176			533


Income from discontinued operations, net of income taxes		90			21
Less: Net income (loss) attributable to noncontrolling interests		(10	)		9

Net income from discontinued operations attributable to Hess Corporation		100			12


Net income attributable to Hess Corporation	$	1,276		$	545


Weighted average common shares outstanding:
Basic		339.2			338.0
Effect of dilutive securities
Restricted common stock		1.3			1.0
Stock options		1.3			1.3
Performance share units		0.8			—

Diluted		342.6			340.3

Net income attributable to Hess Corporation per share:
Basic:
Continuing operations	$	3.47		$	1.58
Discontinued operations		0.29			0.03

Net income per share	$	3.76		$	1.61


Diluted:
Continuing operations	$	3.43		$	1.57
Discontinued operations		0.29			0.03

Net income per share	$	3.72		$	1.60

The Corporation granted 1,199,332 shares of restricted stock and 279,093 performance share units (PSUs) in the first quarter of 2013 and 1,509,752 shares of restricted stock and 415,773 PSUs for the same period in 2012. The weighted average common shares used in the diluted earnings per share calculations exclude the effect of 6,077,460 out-of-the-money stock options for the three months ended March 31, 2013 and 6,641,000 out-of-the-money stock options for the same period in 2012.

Segment Information

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Segment Information

12. Segment Information

The Corporation is an E&P company that develops, produces, purchases, transports and sells crude oil and natural gas. The Corporation also purchases, markets and trades refined petroleum products, natural gas and electricity through its downstream businesses. In the first quarter of 2013, the Corporation announced plans to divest the downstream businesses, which were previously included in the reported Marketing and Refining operating segment. Accordingly, the results of operations for the downstream businesses have been classified as discontinued operations. With this change the Corporation now has one operating segment, Exploration and Production, and a Corporate and Other segment, which is primarily comprised of corporate and interest expenses.

The Corporation’s results by operating segment were as follows:


	Three Months Ended
	March 31,
	2013			2012
	(In millions)
Operating revenues: Exploration and Production	$	3,466		$	2,896


Net income (loss) attributable to Hess Corporation:
Exploration and Production	$	1,286		$	635
Corporate and Other		(110	)		(102	)

Income from continuing operations		1,176			533
Discontinued operations — downstream businesses		100			12

Total	$	1,276		$	545

Identifiable assets by operating segment were as follows:


	March 31, 2013		December 31, 2012
	(In millions)
Exploration and Production	$	36,941	$	37,687
Corporate and Other		484		813
Discontinued operations — downstream businesses		4,954		4,941

Total	$	42,379	$	43,441

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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+ Details

Risk Management and Trading Activities

3 Months Ended

Mar. 31, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Risk Management and Trading Activities

13. Risk Management and Trading Activities

In the normal course of its business, the Corporation is exposed to commodity risks related to changes in the prices of crude oil, natural gas, refined petroleum products and electricity, as well as changes in interest rates and foreign currency values. In the disclosures that follow, risk management activities are referred to as corporate and energy marketing risk management activities. The Corporation also has trading operations, principally through a 50% voting interest in a consolidated partnership, that trades energy-related commodities, securities and derivatives. These activities are also exposed to commodity price risks primarily related to the prices of crude oil, natural gas, refined petroleum products and electricity as well as foreign currency values. In March 2013, the Corporation announced plans to divest the downstream businesses, which include its energy marketing risk management and trading activities. Accordingly, the results from energy marketing risk management and trading activities have been classified as discontinued operations and the related assets and liabilities reported as held for sale in the Consolidated Balance Sheet.

The Corporation maintains a control environment for all of its risk management and trading activities under the direction of its chief risk officer and through its corporate risk policy, which the Corporation’s senior management has approved. Controls include volumetric, term and value at risk limits. The chief risk officer must approve the trading of new instruments or commodities. Risk limits are monitored and reported on a daily basis to business units and senior management. The Corporation’s risk management department also performs independent price verifications (IPV’s) of sources of fair values, validations of valuation models and analyzes changes in fair value measurements on a daily, monthly and/or quarterly basis. The Corporation’s treasury department is responsible for administering foreign exchange rate and interest rate hedging programs using similar controls and processes, where applicable.

The Corporation’s risk management department, in performing the IPV procedures, utilizes independent sources and valuation models that are specific to the individual contracts and pricing locations to identify positions that require adjustments to better reflect the market. This review is performed quarterly and the results are presented to the chief risk officer and senior management. The IPV process considers the reliability of the pricing services through assessing the number of available quotes, the frequency at which data is available and, where appropriate, the comparability between pricing sources.

Following is a description of the Corporation’s activities that use derivatives as part of their operations and strategies. Derivatives include both financial instruments and forward purchase and sale contracts. Gross notional amounts of both long and short positions are presented in the volume tables below. These amounts include long and short positions that offset in closed positions and have not reached contractual maturity. Gross notional amounts do not quantify risk or represent assets or liabilities of the Corporation, but are used in the calculation of cash settlements under the contracts.

Corporate Risk Management Activities: Corporate risk management activities include transactions designed to reduce risk in the selling prices of crude oil, refined petroleum products or natural gas produced by the Corporation or to reduce exposure to foreign currency or interest rate movements. Generally, futures, swaps or option strategies may be used to fix the forward selling price of a portion of the Corporation’s crude oil, refined petroleum products or natural gas production. Forward contracts may also be used to purchase certain currencies in which the Corporation does business with the intent of reducing exposure to foreign currency fluctuations. These forward contracts comprise various currencies including the British Pound and Thai Baht. Interest rate swaps may be used to convert interest payments on certain long-term debt from fixed to floating rates.

The gross volumes of the Corporate risk management derivative contracts outstanding were as follows:


	March 31,		December 31,
	2013		2012
Commodity, primarily crude oil (millions of barrels)		25		1
Foreign exchange (millions of U.S. Dollars)	$	537	$	1,285
Interest rate swaps (millions of U.S. Dollars)	$	880	$	880

In the first quarter of 2013, the Corporation entered into Brent crude oil hedges using fixed-price swap contracts to hedge the variability of forecasted future cash flows from 90,000 barrels of oil per day (bopd) of crude oil sales volumes for the remainder of the calendar year at an average price of approximately $109.70 per barrel. In 2012, the Corporation had entered into Brent crude oil hedges using fixed-price swap contracts to hedge 120,000 bopd of crude oil sales volumes for the full year at an average price of $107.70 per barrel. In 2012, the Corporation also realized hedge losses from previously closed Brent crude oil hedges that covered 24,000 bopd during the year.

Realized losses from Exploration and Production hedging activities reduced Sales and other operating revenues by $18 million and $244 million for the three months ended March 31, 2013 and 2012, respectively ($11 million and $151 million after-taxes, respectively). At March 31, 2013, the after-tax deferred gains in Accumulated other comprehensive income (loss) related to Brent crude oil hedges were $9 million, which will be reclassified into earnings during the remainder of 2013 as the hedged crude oil sales are recognized in earnings. The amount of ineffectiveness from Brent crude oil hedges that was recognized immediately in Sales and other operating revenues was a gain of $15 million and a loss of $11 million for the three months ended March 31, 2013 and 2012, respectively.

At March 31, 2013 and December 31, 2012, the Corporation had interest rate swaps with gross notional amounts of $880 million, which were designated as fair value hedges. Changes in the fair value of interest rate swaps and the hedged fixed-rate debt are recorded in Interest expense in the Statement of Consolidated Income. For the three months ended March 31, 2013 and 2012, the Corporation recorded a decrease of $5 million and $3 million (excluding accrued interest), respectively, in the fair value of interest rate swaps and a corresponding adjustment in the carrying value of the hedged fixed-rate debt.

Gains or losses on foreign exchange contracts that are not designated as hedges are recognized immediately in Other, net in Revenues and non-operating income in the Statement of Consolidated Income. Net realized and unrealized pre-tax gains and losses on foreign exchange contracts amounted to a loss of $33 million and a gain of $26 million for the three months ended March 31, 2013 and 2012, respectively.

Energy Marketing Risk Management Activities: In its energy marketing activities, the Corporation sells refined petroleum products, natural gas and electricity principally to commercial and industrial businesses at fixed and floating prices for varying periods of time. Commodity contracts such as futures, forwards, swaps and options, together with physical assets such as storage and pipeline capacity, are used to obtain supply and reduce margin volatility or lower costs related to sales contracts with customers.

The gross volumes of the Corporation’s energy marketing commodity contracts outstanding were as follows:


	March 31,		December 31,
	2013		2012
Crude oil and refined petroleum products (millions of barrels)		28		26
Natural gas (millions of mcf)		2,913		2,938
Electricity (millions of megawatt hours)		269		278

The changes in fair value of certain energy marketing commodity contracts that are not designated as hedges, as well as revenues from the sales contracts, supply contract purchases and net settlements from financial derivatives related to these energy marketing activities, are recognized currently in Income from discontinued operations in the Statement of Consolidated Income. Net realized and unrealized pre-tax gains and losses on derivative contracts not designated as hedges amounted to gains of $32 million and $55 million for the three months ended March 31, 2013 and 2012, respectively.

At March 31, 2013, a portion of energy marketing commodity contracts were designated as cash flow hedges to hedge variability of expected future cash flows of forecasted supply transactions. The length of time over which the Corporation hedges exposure to variability in future cash flows is predominantly one year or less. For contracts outstanding at March 31, 2013, the maximum duration was approximately three years.

The Corporation recorded the effective portion of changes in the fair value of cash flow hedges as a component of Accumulated other comprehensive income (loss) in the Consolidated Balance Sheet and then reclassified amounts to Income from discontinued operations in the Statement of Consolidated Income as the hedged transactions are recognized in earnings. After-tax deferred losses relating to energy marketing activities recorded in Accumulated other comprehensive income (loss) were $18 million at March 31, 2013 and $22 million at December 31, 2012. After-tax losses of approximately $11 million are expected to be reclassified into Income from discontinued operations over the next twelve months.

The amounts of pre-tax ineffectiveness recognized immediately in Income from discontinued operations were a gain of approximately $1 million and a loss of approximately $1 million for the three months ended March 31, 2013 and 2012, respectively. The pre-tax amount of deferred hedge losses is reflected in Liabilities associated with assets held for sale and the related income tax benefits are recorded as deferred income tax assets, which are included in Other current assets in the Consolidated Balance Sheet.

Trading Activities: Trading activities are conducted principally through a trading partnership in which the Corporation has a 50% voting interest. This consolidated entity operates to generate earnings through various strategies primarily using energy-related commodities, securities and derivatives. The Corporation also takes trading positions for its own account. The information that follows represents 100% of the trading partnership and the Corporation’s proprietary trading accounts.

The gross volumes of derivative contracts outstanding relating to trading activities were as follows:


	March 31,		December 31,
	2013		2012
Commodity
Crude oil and refined petroleum products (millions of barrels)		1,516		1,179
Natural gas (millions of mcf)		3,782		3,377
Electricity (millions of megawatt hours)		12		19
Foreign exchange (millions of U.S. Dollars)	$	178	$	412
Other
Interest rate (millions of U.S. Dollars)	$	149	$	167
Equity securities (millions of shares)		16		14

Pre-tax unrealized and realized gains (losses) recorded in Income from discontinued operations in the Statement of Consolidated Income from trading activities amounted to the following:


	Three Months Ended March 31,
	2013			2012
	(In millions)
Commodity	$	(7	)	$	33
Other		6			1

Total	$	(1	)	$	34

Fair Value Measurements: The Corporation generally enters into master netting arrangements to mitigate legal and counterparty credit risk. Master netting arrangements are generally accepted overarching master contracts that govern all individual transactions with the same counterparty entity as a single legally enforceable agreement. The United States Bankruptcy Code provides for the enforcement of certain termination and netting rights under certain types of contracts upon the bankruptcy filing of a counterparty, commonly known as the “safe harbor” provisions. If a master netting arrangement provides for termination and netting upon the counterparty’s bankruptcy, these rights are generally enforceable with respect to “safe harbor” transactions. If these arrangements provide the right of offset and the Corporation’s intent and practice is to offset amounts in the case of such a termination, the Corporation’s policy is to record the fair value of derivative assets and liabilities on a net basis.

In the normal course of business the Corporation relies on legal and credit risk mitigation clauses providing for adequate credit assurance as well as close-out netting, including two-party netting and single counterparty multilateral netting. As applied to the Corporation, “two-party netting” is the right to net amounts owing under safe harbor transactions between a single defaulting counterparty entity and a single Hess entity, and “single counterparty multilateral netting” is the right to net amounts owing under safe harbor transactions among a single defaulting counterparty entity and multiple Hess entities. The Corporation is reasonably assured that these netting rights would be upheld in a bankruptcy proceeding in the United States in which the defaulting counterparty is a debtor under the United States Bankruptcy Code.

The following table provides information about the effect of netting arrangements on the presentation of the Corporation’s physical and financial derivative assets and (liabilities) that are measured at fair value, with the effect of single counterparty multilateral netting being included in column (iv):


				Gross Amounts Offset in the Consolidated Balance Sheet						Net Amounts			Gross Amounts
	Gross Amounts			Physical Derivative and Financial Instruments			Cash Collateral*			Presented in the Consolidated Balance Sheet			Not Offset in the Consolidated Balance Sheet			Net Amount
	(i)			(ii)			(ii)			(iii) = (i) + (ii)			(iv)			(v) = (iii) + (iv)
	(In millions)
March 31, 2013
Assets
Derivative contracts
Commodity	$	3,613		$	(2,990	)	$	(45	)	$	578		$	(55	)	$	523
Interest rate and other		85			(8	)		(4	)		73			(4	)		69
Counterparty netting		—			(51	)		—			(51	)		—			(51	)

Total derivative contracts	$	3,698		$	(3,049	)	$	(49	)	$	600		$	(59	)	$	541


Liabilities
Derivative contracts
Commodity	$	(3,668	)	$	2,990		$	—		$	(678	)	$	55		$	(623	)
Other		(13	)		8			—			(5	)		4			(1	)
Counterparty netting		—			51			—			51			—			51

Total derivative contracts	$	(3,681	)	$	3,049		$	—		$	(632	)	$	59		$	(573	)


December 31, 2012
Assets
Derivative contracts
Commodity	$	3,253		$	(2,661	)	$	(34	)	$	558		$	(45	)	$	513
Interest rate and other		100			(8	)		—			92			(6	)		86
Counterparty netting		—			(81	)		—			(81	)		—			(81	)

Total derivative contracts	$	3,353		$	(2,750	)	$	(34	)	$	569		$	(51	)	$	518


Liabilities
Derivative contracts
Commodity	$	(3,312	)	$	2,661		$	5		$	(646	)	$	45		$	(601	)
Other		(10	)		8			—			(2	)		6			4
Counterparty netting		—			81			—			81			—			81

Total derivative contracts	$	(3,322	)	$	2,750		$	5		$	(567	)	$	51		$	(516	)

*	There is no cash collateral that was not offset in the Consolidated Balance Sheet.

Included in net assets and liabilities that were offset in the Consolidated Balance Sheet as reflected in column (iii) of the table above were the assets and liabilities related to the Corporation’s discontinued operations in the amounts of $487 million and $628 million as of March 31, 2013, respectively ($483 million and $565 million as of December 31, 2012). The amounts at March 31, 2013 were classified as held for sale in the Consolidated Balance Sheet. The remainder of net assets and liabilities that were offset in the Consolidated Balance Sheet as reflected in column (iii) of the table above, related to the Corporation’s continuing operations and were included in Accounts receivable — Trade and Accounts payable, respectively.

The table below reflects the gross and net fair values of the corporate and energy marketing risk management and trading derivative instruments.


	Accounts Receivable			Accounts Payable
	(In millions)
March 31, 2013
Derivative contracts designated as hedging instruments
Commodity	$	90		$	(93	)
Interest rate and other		62			(2	)

Total derivative contracts designated as hedging instruments		152			(95	)


Derivative contracts not designated as hedging instruments*
Commodity		3,523			(3,575	)
Foreign exchange		9			(3	)
Other		14			(8	)

Total derivative contracts not designated as hedging instruments		3,546			(3,586	)


Gross fair value of derivative contracts		3,698			(3,681	)
Master netting arrangements		(3,049	)		3,049
Cash collateral (received) posted		(49	)		—

Net fair value of derivative contracts	$	600		$	(632	)


December 31, 2012
Derivative contracts designated as hedging instruments
Commodity	$	65		$	(124	)
Interest rate and other		72			(2	)

Total derivative contracts designated as hedging instruments		137			(126	)


Derivative contracts not designated as hedging instruments*
Commodity		3,188			(3,188	)
Foreign exchange		14			—
Other		14			(8	)

Total derivative contracts not designated as hedging instruments		3,216			(3,196	)


Gross fair value of derivative contracts		3,353			(3,322	)
Master netting arrangements		(2,750	)		2,750
Cash collateral (received) posted		(34	)		5

Net fair value of derivative contracts	$	569		$	(567	)

*	Includes trading derivatives and derivatives used for risk management.

The Corporation determines fair value in accordance with the fair value measurements accounting standard (Accounting Standards Codification 820 — Fair Value Measurements and Disclosures), which established a hierarchy that categorizes the sources of inputs, which generally range from quoted prices for identical instruments in a principal trading market (Level 1) to estimates determined using related market data (Level 3). Measurements derived indirectly from observable inputs or from quoted prices from markets that are less liquid are considered Level 2.

When Level 1 inputs are available within a particular market, those inputs are selected for determination of fair value over Level 2 or 3 inputs in the same market. To value derivatives that are characterized as Level 2 and 3, the Corporation uses observable inputs for similar instruments that are available from exchanges, pricing services or broker quotes. These observable inputs may be supplemented with other methods, including internal extrapolation or interpolation, that result in the most representative prices for instruments with similar characteristics. Multiple inputs may be used to measure fair value, however, the level of fair value for each physical derivative and financial asset or liability presented below is based on the lowest significant input level within this fair value hierarchy.

The following table provides the Corporation’s net physical derivative and financial assets and (liabilities) that are measured at fair value based on this hierarchy:


	Level 1			Level 2			Level 3			Counterparty netting			Collateral			Balance
	(In millions)
March 31, 2013
Assets
Derivative contracts
Commodity	$	93		$	468		$	217		$	(155	)	$	(45	)	$	578
Interest rate and other		8			70			—			(1	)		(4	)		73
Collateral and counterparty netting		(1	)		(46	)		(4	)		—			—			(51	)

Total derivative contracts		100			492			213			(156	)		(49	)		600
Other assets measured at fair value on a recurring basis		—			31			—			—			—			31

Total assets measured at fair value on a recurring basis	$	100		$	523		$	213		$	(156	)	$	(49	)	$	631	(a)


Liabilities
Derivative contracts
Commodity	$	(93	)	$	(594	)	$	(146	)	$	155		$	—		$	(678	)
Other		(1	)		(4	)		(1	)		1			—			(5	)
Collateral and counterparty netting		1			46			4			—			—			51

Total derivative contracts		(93	)		(552	)		(143	)		156			—			(632	)
Other liabilities measured at fair value on a recurring basis		(54	)		—			—			—			—			(54	)

Total liabilities measured at fair value on a recurring basis	$	(147	)	$	(552	)	$	(143	)	$	156		$	—		$	(686	)(b)

Other fair value measurement disclosures Long-term debt	$	—		$	(6,909	)	$	—		$	—		$	—		$	(6,909	)

(a)

Includes a total of $113 million of Commodity and Interest rate and other Level 2 assets that relate to corporate risk management activities.

(b)

Includes $4 million of Other Level 2 liabilities that relate to corporate risk management activities.


	Level 1			Level 2			Level 3			Counterparty netting			Collateral			Balance
	(In millions)
December 31, 2012
Assets
Derivative contracts
Commodity	$	94		$	445		$	243		$	(190	)	$	(34	)	$	558
Interest rate and other		6			86			1			(1	)		—			92
Collateral and counterparty netting		(23	)		(54	)		(4	)		—			—			(81	)

Total derivative contracts		77			477			240			(191	)		(34	)		569
Other assets measured at fair value on a recurring basis		5			49			—			(2	)		—			52

Total assets measured at fair value on a recurring basis	$	82		$	526		$	240		$	(193	)	$	(34	)	$	621


Liabilities
Derivative contracts
Commodity	$	(83	)	$	(657	)	$	(101	)	$	190		$	5		$	(646	)
Other		(1	)		(2	)		—			1			—			(2	)
Collateral and counterparty netting		23			54			4			—			—			81

Total derivative contracts		(61	)		(605	)		(97	)		191			5			(567	)
Other liabilities measured at fair value on a recurring basis		(40	)		(2	)		(2	)		2			—			(42	)

Total liabilities measured at fair value on a recurring basis	$	(101	)	$	(607	)	$	(99	)	$	193		$	5		$	(609	)

Other fair value measurement disclosures Long-term debt	$	—		$	(8,887	)	$	—		$	—		$	—		$	(8,887	)

The following table provides net transfers into and out of each level of the fair value hierarchy:


	Three Months Ended March 31,
	2013			2012
	(In millions)
Transfers into Level 1	$	(1	)	$	4
Transfers out of Level 1		—			(9	)

	$	(1	)	$	(5	)


Transfers into Level 2	$	—		$	49
Transfers out of Level 2		(1	)		(19	)

	$	(1	)	$	30


Transfers into Level 3	$	2		$	27
Transfers out of Level 3		—			(52	)

	$	2		$	(25	)

The Corporation’s policy is to recognize transfers in and transfers out as of the end of the reporting period. Transfers between levels result from the passage of time as contracts move closer to their maturities, fluctuations in the market liquidity for certain contracts and/or changes in the level of significance of fair value measurement inputs.

The following table provides changes in physical derivatives and financial assets and (liabilities) that are measured at fair value based on Level 3 inputs, which are all related to discontinued operations:


	Three Months Ended March 31,
	2013			2012
	(In millions)
Balance at beginning of period	$	141		$	(143	)
Unrealized pre-tax gains (losses) (a)		(63	)		(123	)
Purchases (b)		28			220
Sales (b)		(23	)		(234	)
Settlements (c)		(15	)		37
Transfers into Level 3		2			27
Transfers out of Level 3		—			(52	)

Balance at end of period	$	70		$	(268	)

(a)

All of the unrealized pre-tax gains and losses included in earnings were reflected in Income from discontinued operations in the Statement of Consolidated Income.

(b)

Purchases and sales primarily represent option premiums paid or received, respectively, during the reporting period and are reflected in Income from discontinued operations in the Statement of Consolidated Income.

(c)

Settlements represent realized gains and losses on derivatives settled during the reporting period and are reflected in Income from discontinued operations in the Statement of Consolidated Income.

The significant unobservable inputs used in Level 3 fair value measurements for the Corporation’s physical commodity contracts and derivative instruments primarily include less liquid delivered locations for physical commodity contracts or volatility assumptions for out-of-the-money options. The following table provides information about the Corporation’s significant recurring unobservable inputs used in the Level 3 fair value measurements. Natural gas contracts are usually quoted and transacted using basis pricing relative to an active pricing location (e.g., Henry Hub), for which price inputs represent the approximate value of differences in geography and local market conditions. All other price inputs below represent full contract prices. Significant changes in any of the inputs below, independently or correlated, may result in a different fair value.


	Unit of Measurement	Range / Weighted Average
March 31, 2013
Assets
Commodity contracts with a fair value of $217 million (a) Contract prices
Crude oil and refined petroleum products	$ / bbl (c)	$	98.30 - 134.65 / 120.61
Electricity	$ / MWH (d)	$	26.14 - 90.62 / 45.83

Basis prices
Natural gas	$ / MMBTU (e)	$	(0.40) - 5.80 / 0.31

Contract volatilities
Crude oil and refined petroleum products	%		15.00 - 19.00 / 16.00
Natural gas	%		21.00 - 30.00 / 23.00
Electricity	%		17.00 - 34.00 / 24.00


Liabilities
Commodity contracts with a fair value of $146 million (b) Contract prices
Crude oil and refined petroleum products	$ / bbl (c)	$	97.96 - 135.00 / 116.42
Electricity	$ / MWH (d)	$	26.24 - 81.21 / 48.23

Basis prices
Natural gas	$ / MMBTU (e)	$	(0.40) - 5.88 / 0.80

Contract volatilities
Crude oil and refined petroleum products	%		15.00 - 19.00 / 16.00
Natural gas	%		21.00 - 30.00 / 21.00


December 31, 2012
Assets
Commodity contracts with a fair value of $243 million Contract prices
Crude oil and refined petroleum products	$ / bbl (c)	$	79.35 - 144.27 / 113.06
Electricity	$ / MWH (d)	$	23.37 - 79.27 / 40.81

Basis prices
Natural gas	$ / MMBTU (e)	$	(0.47) - 6.66 / 0.39

Contract volatilities
Crude oil and refined petroleum products	%		23.00 - 27.00 / 26.00
Natural gas	%		21.00 - 36.00 / 25.00
Electricity	%		18.00 - 40.00 / 28.00


Liabilities
Commodity contracts with a fair value of $101 million Contract prices
Crude oil and refined petroleum products	$ / bbl (c)	$	83.49 - 133.38 / 109.94
Electricity	$ / MWH (d)	$	25.01 - 72.60 / 40.38

Basis prices
Natural gas	$ / MMBTU (e)	$	(0.72) - 6.66 / 1.26

Contract volatilities
Crude oil and refined petroleum products	%		24.00 - 27.00 / 26.00
Natural gas	%		21.00 - 28.00 / 22.00

(a)

Included in Assets held for sale.

(b)

Included in Liabilities associated with assets held for sale.

(c)

Price per barrel.

(d)

Price per megawatt hour.

(e)

Price per million British thermal units.

Note: Fair value measurement for all recurring inputs was performed using a combination of income and market approach techniques.

Credit Risk: The Corporation is exposed to credit risks that may at times be concentrated with certain counterparties, groups of counterparties or customers. Accounts receivable are generated from a diverse domestic and international customer base. The Corporation’s net Accounts receivable — Trade at March 31, 2013 are concentrated with the following counterparty and customer industry segments: Integrated Oil Companies — 40%, Refiners — 27%, Government Entities — 24% and Financial Institutions — 7%. The Corporation reduces its risk related to certain counterparties by using master netting arrangements and requiring collateral, generally cash or letters of credit. The Corporation records the cash collateral received or posted as an offset to the fair value of derivatives executed with the same counterparty. At March 31, 2013 and December 31, 2012, the Corporation held cash from counterparties of $49 million and $34 million, respectively. The Corporation did not have cash posted to counterparties at March 31, 2013, compared with $5 million at December 31, 2012.

At March 31, 2013, the Corporation had outstanding letters of credit totaling $542 million, primarily issued to satisfy margin requirements (approximately $400 million related to discontinued operations). Certain of the Corporation’s agreements also contain contingent collateral provisions that could require the Corporation to post additional collateral if the Corporation’s credit rating declines. As of March 31, 2013, the net liability related to derivatives with contingent collateral provisions was approximately $130 million, primarily related to discontinued operations. There was no cash collateral posted on those derivatives. At March 31, 2013, all three major credit rating agencies that rate the Corporation’s debt had assigned an investment grade rating. If two of the three agencies were to downgrade the Corporation’s rating to below investment grade, as of March 31, 2013, the Corporation would be required to post additional collateral of approximately $85 million.

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2013
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events In April 2013, the Corporation completed the sale of 100% of its Russian subsidiary Samara-Nafta for cash proceeds of $2.05 billion. Based on its 90% interest in Samara-Nafta, total after-tax proceeds to the Corporation were approximately $1.9 billion after working capital and other adjustments. Subsequent to quarter end, the Corporation repaid $1,620 million of borrowings under its credit facilities, which was the total amount outstanding at March 31, 2013.

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2013
Accounting Policies [Abstract]
Recently Adopted Accounting Pronouncements	*Recently adopted accounting pronouncements:* Effective January 1, 2013, the Corporation adopted ASU 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (AOCI) which requires aggregated disclosures of amounts reclassified out of AOCI as well as a presentation of changes in AOCI balances by component. The changes in AOCI by component, including amounts reclassified out of AOCI in their entirety are presented in the Statement of Consolidated Comprehensive Income. Effective January 1, 2013, the Corporation adopted ASU 2011-11, Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities which requires disclosure of information needed to evaluate the effects or potential effects of the contractual right of setoff for assets and liabilities. This accounting standard update applies to assets and liabilities related to financial instruments and derivatives subject to an enforceable master netting arrangement or similar agreement. The required disclosures are presented in Note 13, Risk Management and Trading Activities.

Discontinued Operations (Tables)

3 Months Ended

Mar. 31, 2013

Discontinued Operations And Disposal Groups [Abstract]

Summary of Sales and Other Operating Revenues and Income from Discontinued Operations

Sales and other operating revenues and income from discontinued operations for the downstream businesses were as follows:


	Three Months Ended March 31,
	2013			2012
	(In millions)
Sales and other operating revenues	$	7,413		$	6,800

Income from discontinued operations before income taxes	$	144		$	30
Provision for income taxes		54			9

Income from discontinued operations, net of income taxes		90			21
Less: Net income (loss) attributable to noncontrolling interests		(10	)		9

Net income from discontinued operations attributable to Hess Corporation	$	100		$	12

Summary of Assets and Liabilities of Discontinued Downstream Businesses

The following table presents the assets and liabilities of the discontinued downstream businesses that are classified as held for sale (in millions):


	March 31,
	2013
Accounts receivable	$	2,888
Inventories		457
Investment in affiliates		173
Property, plant and equipment, net		1,130
Other assets		145

Total assets	$	4,793


Accounts payable and accrued liabilities	$	2,467
Other liabilities and deferred credits		143

Total liabilities	$	2,610

Exit and Disposal Costs (Tables)

3 Months Ended

Mar. 31, 2013

Restructuring And Related Activities [Abstract]

Components of and Changes in Restructuring Accruals

The following table provides the components of and changes in the Corporation’s restructuring accruals:


	E&P		Corporate and Other		Discontinued Operations (a)			Total
	(In millions)
Employee Severance
Balance at beginning of period	$	—	$	—	$	—		$	—
Provision		71		18		69			158	(b)
Payments		—		—		—			—

Balance at March 31, 2013		71		18		69			158

Facility Exit Costs
Balance at beginning of period		—		—		—			—
Provision		—		—		21			21	(c)
Payments		—		—		(2	)		(2	)

Balance at March 31, 2013		—		—		19			19


Total restructuring accruals at March 31, 2013	$	71	$	18	$	88		$	177

(a)

Comprises the downstream businesses.

(b)

(c)

Included in Income from discontinued operations.

Inventories (Tables)

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following:


	March 31, 2013		December 31, 2012
	(In millions)
Crude oil and other charge stocks	$	284	$	493
Refined petroleum products and natural gas		—		1,362
Less: LIFO		—		(1,123	)

		284		732
Merchandise, materials and supplies		402		527

Total inventories	$	686	$	1,259

Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Net Changes in Capitalized Exploratory Well Costs


Balance at January 1	$	2,259
Additions to capitalized exploratory well costs pending the determination of proved reserves		100
Reclassifications to wells, facilities and equipment based on the determination of proved reserves		(4	)
Capitalized exploratory well costs charged to expense		(2	)
Dispositions		(78	)

Balance at end of period	$	2,275

- Definition

Tabular disclosure of the aggregate of costs (whether the costs are capitalized or charged to expense at the time they are incurred ) incurred for the year in oil and gas property acquisition, exploration and development activities.

+ References + Details

Goodwill (Tables)

3 Months Ended

Mar. 31, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill, all of which relate to the E&P segment, are as follows (in millions):


	March 31, 2013
Balance at beginning of period	$	2,208
Reclassified to Assets held for sale		(339	)

Balance at end of period	$	1,869

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Foreign Currency (Tables)

3 Months Ended

Mar. 31, 2013

Foreign Currency [Abstract]

Pre-Tax Foreign Currency Gains (Losses)

Pre-tax foreign currency gains (losses) included in Other, net in the Statement of Consolidated Income amounted to the following:


	Three Months Ended March 31,
	2013			2012
	(In millions)
Pre-tax foreign currency gains (losses)	$	(31	)	$	21

Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2013

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Pension Cost

Components of net periodic pension cost consisted of the following:


	Three Months Ended March 31,
	2013			2012
	(In millions)
Service cost	$	20		$	18
Interest cost		22			22
Expected return on plan assets		(33	)		(29	)
Amortization of net loss		21			21

Pension expense	$	30		$	32

- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2439-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2417-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2410-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=21916443&loc=d3e4179-114921

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 4, 7, 16, 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Weighted Average Common Shares (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Net Income and Weighted Average Number of Common Shares Used in Basic and Diluted Earnings Per Share Computations

The net income and weighted average number of common shares used in the basic and diluted earnings per share computations were as follows:


	Three Months Ended
	March 31,
	2013			2012
	(In millions, except per share amounts)
Income from continuing operations, net of income taxes	$	1,183		$	539
Less: Net income (loss) attributable to noncontrolling interests		7			6

Net income from continuing operations attributable to Hess Corporation		1,176			533


Income from discontinued operations, net of income taxes		90			21
Less: Net income (loss) attributable to noncontrolling interests		(10	)		9

Net income from discontinued operations attributable to Hess Corporation		100			12


Net income attributable to Hess Corporation	$	1,276		$	545


Weighted average common shares outstanding:
Basic		339.2			338.0
Effect of dilutive securities
Restricted common stock		1.3			1.0
Stock options		1.3			1.3
Performance share units		0.8			—

Diluted		342.6			340.3

Net income attributable to Hess Corporation per share:
Basic:
Continuing operations	$	3.47		$	1.58
Discontinued operations		0.29			0.03

Net income per share	$	3.76		$	1.61


Diluted:
Continuing operations	$	3.43		$	1.57
Discontinued operations		0.29			0.03

Net income per share	$	3.72		$	1.60

Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Corporation's Results by Operating Segment

The Corporation’s results by operating segment were as follows:


	Three Months Ended
	March 31,
	2013			2012
	(In millions)
Operating revenues: Exploration and Production	$	3,466		$	2,896


Net income (loss) attributable to Hess Corporation:
Exploration and Production	$	1,286		$	635
Corporate and Other		(110	)		(102	)

Income from continuing operations		1,176			533
Discontinued operations — downstream businesses		100			12

Total	$	1,276		$	545

Identifiable Assets by Operating Segment

Identifiable assets by operating segment were as follows:


	March 31, 2013		December 31, 2012
	(In millions)
Exploration and Production	$	36,941	$	37,687
Corporate and Other		484		813
Discontinued operations — downstream businesses		4,954		4,941

Total	$	42,379	$	43,441

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Risk Management and Trading Activities (Tables)

3 Months Ended

Mar. 31, 2013

Pre-Tax Gains (Losses) from Trading Activities

Pre-tax unrealized and realized gains (losses) recorded in Income from discontinued operations in the Statement of Consolidated Income from trading activities amounted to the following:


	Three Months Ended March 31,
	2013			2012
	(In millions)
Commodity	$	(7	)	$	33
Other		6			1

Total	$	(1	)	$	34

Netting Arrangements on Physical and Financial Derivative Assets and Liabilities


				Gross Amounts Offset in the Consolidated Balance Sheet						Net Amounts			Gross Amounts
	Gross Amounts			Physical Derivative and Financial Instruments			Cash Collateral*			Presented in the Consolidated Balance Sheet			Not Offset in the Consolidated Balance Sheet			Net Amount
	(i)			(ii)			(ii)			(iii) = (i) + (ii)			(iv)			(v) = (iii) + (iv)
	(In millions)
March 31, 2013
Assets
Derivative contracts
Commodity	$	3,613		$	(2,990	)	$	(45	)	$	578		$	(55	)	$	523
Interest rate and other		85			(8	)		(4	)		73			(4	)		69
Counterparty netting		—			(51	)		—			(51	)		—			(51	)

Total derivative contracts	$	3,698		$	(3,049	)	$	(49	)	$	600		$	(59	)	$	541


Liabilities
Derivative contracts
Commodity	$	(3,668	)	$	2,990		$	—		$	(678	)	$	55		$	(623	)
Other		(13	)		8			—			(5	)		4			(1	)
Counterparty netting		—			51			—			51			—			51

Total derivative contracts	$	(3,681	)	$	3,049		$	—		$	(632	)	$	59		$	(573	)


December 31, 2012
Assets
Derivative contracts
Commodity	$	3,253		$	(2,661	)	$	(34	)	$	558		$	(45	)	$	513
Interest rate and other		100			(8	)		—			92			(6	)		86
Counterparty netting		—			(81	)		—			(81	)		—			(81	)

Total derivative contracts	$	3,353		$	(2,750	)	$	(34	)	$	569		$	(51	)	$	518


Liabilities
Derivative contracts
Commodity	$	(3,312	)	$	2,661		$	5		$	(646	)	$	45		$	(601	)
Other		(10	)		8			—			(2	)		6			4
Counterparty netting		—			81			—			81			—			81

Total derivative contracts	$	(3,322	)	$	2,750		$	5		$	(567	)	$	51		$	(516	)

*	There is no cash collateral that was not offset in the Consolidated Balance Sheet.

Gross and Net Fair Values of Corporate and Energy Marketing Risk Management and Trading Derivative Instruments

The table below reflects the gross and net fair values of the corporate and energy marketing risk management and trading derivative instruments.


	Accounts Receivable			Accounts Payable
	(In millions)
March 31, 2013
Derivative contracts designated as hedging instruments
Commodity	$	90		$	(93	)
Interest rate and other		62			(2	)

Total derivative contracts designated as hedging instruments		152			(95	)


Derivative contracts not designated as hedging instruments*
Commodity		3,523			(3,575	)
Foreign exchange		9			(3	)
Other		14			(8	)

Total derivative contracts not designated as hedging instruments		3,546			(3,586	)


Gross fair value of derivative contracts		3,698			(3,681	)
Master netting arrangements		(3,049	)		3,049
Cash collateral (received) posted		(49	)		—

Net fair value of derivative contracts	$	600		$	(632	)


December 31, 2012
Derivative contracts designated as hedging instruments
Commodity	$	65		$	(124	)
Interest rate and other		72			(2	)

Total derivative contracts designated as hedging instruments		137			(126	)


Derivative contracts not designated as hedging instruments*
Commodity		3,188			(3,188	)
Foreign exchange		14			—
Other		14			(8	)

Total derivative contracts not designated as hedging instruments		3,216			(3,196	)


Gross fair value of derivative contracts		3,353			(3,322	)
Master netting arrangements		(2,750	)		2,750
Cash collateral (received) posted		(34	)		5

Net fair value of derivative contracts	$	569		$	(567	)

*	Includes trading derivatives and derivatives used for risk management.

Fair Values for Corporation's Net Physical Derivative and Financial Assets and Liabilities

The following table provides the Corporation’s net physical derivative and financial assets and (liabilities) that are measured at fair value based on this hierarchy:


	Level 1			Level 2			Level 3			Counterparty netting			Collateral			Balance
	(In millions)
March 31, 2013
Assets
Derivative contracts
Commodity	$	93		$	468		$	217		$	(155	)	$	(45	)	$	578
Interest rate and other		8			70			—			(1	)		(4	)		73
Collateral and counterparty netting		(1	)		(46	)		(4	)		—			—			(51	)

Total derivative contracts		100			492			213			(156	)		(49	)		600
Other assets measured at fair value on a recurring basis		—			31			—			—			—			31

Total assets measured at fair value on a recurring basis	$	100		$	523		$	213		$	(156	)	$	(49	)	$	631	(a)


Liabilities
Derivative contracts
Commodity	$	(93	)	$	(594	)	$	(146	)	$	155		$	—		$	(678	)
Other		(1	)		(4	)		(1	)		1			—			(5	)
Collateral and counterparty netting		1			46			4			—			—			51

Total derivative contracts		(93	)		(552	)		(143	)		156			—			(632	)
Other liabilities measured at fair value on a recurring basis		(54	)		—			—			—			—			(54	)

Total liabilities measured at fair value on a recurring basis	$	(147	)	$	(552	)	$	(143	)	$	156		$	—		$	(686	)(b)

Other fair value measurement disclosures Long-term debt	$	—		$	(6,909	)	$	—		$	—		$	—		$	(6,909	)

(a)

Includes a total of $113 million of Commodity and Interest rate and other Level 2 assets that relate to corporate risk management activities.

(b)

Includes $4 million of Other Level 2 liabilities that relate to corporate risk management activities.


	Level 1			Level 2			Level 3			Counterparty netting			Collateral			Balance
	(In millions)
December 31, 2012
Assets
Derivative contracts
Commodity	$	94		$	445		$	243		$	(190	)	$	(34	)	$	558
Interest rate and other		6			86			1			(1	)		—			92
Collateral and counterparty netting		(23	)		(54	)		(4	)		—			—			(81	)

Total derivative contracts		77			477			240			(191	)		(34	)		569
Other assets measured at fair value on a recurring basis		5			49			—			(2	)		—			52

Total assets measured at fair value on a recurring basis	$	82		$	526		$	240		$	(193	)	$	(34	)	$	621


Liabilities
Derivative contracts
Commodity	$	(83	)	$	(657	)	$	(101	)	$	190		$	5		$	(646	)
Other		(1	)		(2	)		—			1			—			(2	)
Collateral and counterparty netting		23			54			4			—			—			81

Total derivative contracts		(61	)		(605	)		(97	)		191			5			(567	)
Other liabilities measured at fair value on a recurring basis		(40	)		(2	)		(2	)		2			—			(42	)

Total liabilities measured at fair value on a recurring basis	$	(101	)	$	(607	)	$	(99	)	$	193		$	5		$	(609	)

Other fair value measurement disclosures Long-term debt	$	—		$	(8,887	)	$	—		$	—		$	—		$	(8,887	)

Net Transfers Into and Out of Each Level of Fair Value Hierarchy

The following table provides net transfers into and out of each level of the fair value hierarchy:


	Three Months Ended March 31,
	2013			2012
	(In millions)
Transfers into Level 1	$	(1	)	$	4
Transfers out of Level 1		—			(9	)

	$	(1	)	$	(5	)

Transfers into Level 2	$	—		$	49
Transfers out of Level 2		(1	)		(19	)

	$	(1	)	$	30

Transfers into Level 3	$	2		$	27
Transfers out of Level 3		—			(52	)

	$	2		$	(25	)

Changes in Physical Derivatives and Financial Assets and Liabilities that are Measured at Fair Value Based on Level 3 Inputs


	Three Months Ended March 31,
	2013			2012
	(In millions)
Balance at beginning of period	$	141		$	(143	)
Unrealized pre-tax gains (losses) (a)		(63	)		(123	)
Purchases (b)		28			220
Sales (b)		(23	)		(234	)
Settlements (c)		(15	)		37
Transfers into Level 3		2			27
Transfers out of Level 3		—			(52	)

Balance at end of period	$	70		$	(268	)

(a)

All of the unrealized pre-tax gains and losses included in earnings were reflected in Income from discontinued operations in the Statement of Consolidated Income.

(b)

(c)

Settlements represent realized gains and losses on derivatives settled during the reporting period and are reflected in Income from discontinued operations in the Statement of Consolidated Income.

Risk Management and Trading Activities

The following table provides information about the Corporation’s significant recurring unobservable inputs used in the Level 3 fair value measurements. Natural gas contracts are usually quoted and transacted using basis pricing relative to an active pricing location (e.g., Henry Hub), for which price inputs represent the approximate value of differences in geography and local market conditions. All other price inputs below represent full contract prices. Significant changes in any of the inputs below, independently or correlated, may result in a different fair value.


	Unit of Measurement	Range / Weighted Average
March 31, 2013
Assets
Commodity contracts with a fair value of $217 million (a) Contract prices
Crude oil and refined petroleum products	$ / bbl (c)	$	98.30 - 134.65 / 120.61
Electricity	$ / MWH (d)	$	26.14 - 90.62 / 45.83

Basis prices
Natural gas	$ / MMBTU (e)	$	(0.40) - 5.80 / 0.31

Contract volatilities
Crude oil and refined petroleum products	%		15.00 - 19.00 / 16.00
Natural gas	%		21.00 - 30.00 / 23.00
Electricity	%		17.00 - 34.00 / 24.00


Liabilities
Commodity contracts with a fair value of $146 million (b) Contract prices
Crude oil and refined petroleum products	$ / bbl (c)	$	97.96 - 135.00 / 116.42
Electricity	$ / MWH (d)	$	26.24 - 81.21 / 48.23

Basis prices
Natural gas	$ / MMBTU (e)	$	(0.40) - 5.88 / 0.80

Contract volatilities
Crude oil and refined petroleum products	%		15.00 - 19.00 / 16.00
Natural gas	%		21.00 - 30.00 / 21.00


December 31, 2012
Assets
Commodity contracts with a fair value of $243 million Contract prices
Crude oil and refined petroleum products	$ / bbl (c)	$	79.35 - 144.27 / 113.06
Electricity	$ / MWH (d)	$	23.37 - 79.27 / 40.81

Basis prices
Natural gas	$ / MMBTU (e)	$	(0.47) - 6.66 / 0.39

Contract volatilities
Crude oil and refined petroleum products	%		23.00 - 27.00 / 26.00
Natural gas	%		21.00 - 36.00 / 25.00
Electricity	%		18.00 - 40.00 / 28.00


Liabilities
Commodity contracts with a fair value of $101 million Contract prices
Crude oil and refined petroleum products	$ / bbl (c)	$	83.49 - 133.38 / 109.94
Electricity	$ / MWH (d)	$	25.01 - 72.60 / 40.38

Basis prices
Natural gas	$ / MMBTU (e)	$	(0.72) - 6.66 / 1.26

Contract volatilities
Crude oil and refined petroleum products	%		24.00 - 27.00 / 26.00
Natural gas	%		21.00 - 28.00 / 22.00

(a)

Included in Assets held for sale.

(b)

Included in Liabilities associated with assets held for sale.

(c)

Price per barrel.

(d)

Price per megawatt hour.

(e)

Price per million British thermal units.

Corporate Risk Management [Member]

Gross Volumes of Corporation's Derivative Instruments Outstanding

The gross volumes of the Corporate risk management derivative contracts outstanding were as follows:


	March 31, 2013		December 31, 2012
Commodity, primarily crude oil (millions of barrels)		25		1
Foreign exchange (millions of U.S. Dollars)	$	537	$	1,285
Interest rate swaps (millions of U.S. Dollars)	$	880	$	880

Energy Marketing [Member]

Gross Volumes of Corporation's Derivative Instruments Outstanding

The gross volumes of the Corporation’s energy marketing commodity contracts outstanding were as follows:


	March 31, 2013		December 31, 2012
Crude oil and refined petroleum products (millions of barrels)		28		26
Natural gas (millions of mcf)		2,913		2,938
Electricity (millions of megawatt hours)		269		278

Trading Companies [Member]

Gross Volumes of Corporation's Derivative Instruments Outstanding

The gross volumes of derivative contracts outstanding relating to trading activities were as follows:


	March 31, 2013		December 31, 2012
Commodity
Crude oil and refined petroleum products (millions of barrels)		1,516		1,179
Natural gas (millions of mcf)		3,782		3,377
Electricity (millions of megawatt hours)		12		19
Foreign exchange (millions of U.S. Dollars)	$	178	$	412
Other
Interest rate (millions of U.S. Dollars)	$	149	$	167
Equity securities (millions of shares)		16		14

Basis of Presentation - Additional Information (Detail)	3 Months Ended
Basis of Presentation - Additional Information (Detail)	Mar. 31, 2013
Accounting Policies [Abstract]
Anticipated completion of divestitures	One year

Discontinued Operations - Summary of Sales and Other Operating Revenues and Net Income from Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Discontinued Operations [Line Items]
Income from discontinued operations, net of income taxes	$ 90	$ 21
Less: Net income (loss) attributable to noncontrolling interests	(10)	9
Net income from discontinued operations attributable to Hess Corporation	100	12
Discontinued Downstream Business [Member]
Discontinued Operations [Line Items]
Sales and other operating revenues	7,413	6,800
Income from discontinued operations before income taxes	144	30
Provision for income taxes	54	9
Income from discontinued operations, net of income taxes	90	21
Less: Net income (loss) attributable to noncontrolling interests	(10)	9
Net income from discontinued operations attributable to Hess Corporation	$ 100	$ 12

- Definition

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References + Details

- Definition

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b),(c)
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e38679-109324

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 47
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.12)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.14)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 13
-Article 7

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 47
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 15
-Article 5

+ Details

- Definition

This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items, which is apportioned to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This item includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References + Details

- Definition

Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References + Details

Discontinued Operations - Summary of Main Classes of Assets and Liabilities Related to Discontinued Downstream Business (Detail) - Discontinued Downstream Business [Member] $ in Millions	Mar. 31, 2013 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable	$ 2,888
Inventories	457
Investment in affiliates	173
Property, plant and equipment, net	1,130
Other assets	145
Total assets	4,793
Accounts payable and accrued liabilities	2,467
Other liabilities and deferred credits	143
Total liabilities	$ 2,610

Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Income Statement by Disposal Groups, Including Discontinued Operations [Line Items]
Refined petroleum products and natural gas		$ 1,362
Less: Last-in, first-out (LIFO) adjustment		1,123
Other inventories	$ 402	$ 527
Discontinued Downstream Business [Member]
Income Statement by Disposal Groups, Including Discontinued Operations [Line Items]
Refined petroleum products and natural gas	1,200
Less: Last-in, first-out (LIFO) adjustment	851
Other inventories	$ 108

Exit and Disposal Costs - Components of and Changes in Restructuring Accruals (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	$ 177
Balance at ending of period	177
Employee Severance Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	158
Balance at beginning of period
Provision	158
Payments
Balance at ending of period	158
Facility Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	19
Balance at beginning of period
Provision	21
Payments	(2)
Balance at ending of period	19
Exploration and Production [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	71
Balance at ending of period	71
Exploration and Production [Member] \| Employee Severance Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	71
Balance at beginning of period
Provision	71
Payments
Balance at ending of period	71
Exploration and Production [Member] \| Facility Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals
Balance at beginning of period
Provision
Payments
Balance at ending of period
Corporate and Other [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	18
Balance at ending of period	18
Corporate and Other [Member] \| Employee Severance Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	18
Balance at beginning of period
Provision	18
Payments
Balance at ending of period	18
Corporate and Other [Member] \| Facility Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals
Balance at beginning of period
Provision
Payments
Balance at ending of period
Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	88
Balance at ending of period	88
Discontinued Operations [Member] \| Employee Severance Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	69
Balance at beginning of period
Provision	69
Payments
Balance at ending of period	69
Discontinued Operations [Member] \| Facility Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring accruals	19
Balance at beginning of period
Provision	21
Payments	(2)
Balance at ending of period	$ 19

Exit and Disposal Costs - Components of and Changes in Restructuring Accruals (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Restructuring Cost and Reserve [Line Items]
Income from discontinued operations	$ 90	$ 21
Employee Severance Costs [Member]
Restructuring Cost and Reserve [Line Items]
Provision	158
Employee Severance Costs [Member] \| Exploration and Production [Member]
Restructuring Cost and Reserve [Line Items]
Provision	71
Employee Severance Costs [Member] \| Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Provision	69
Income from discontinued operations	69
Employee Severance Costs [Member] \| Operating costs and expenses [Member] \| Exploration and Production [Member]
Restructuring Cost and Reserve [Line Items]
Provision	34
Employee Severance Costs [Member] \| Exploration expenses [Member] \| Exploration and Production [Member]
Restructuring Cost and Reserve [Line Items]
Provision	14
Employee Severance Costs [Member] \| General and administrative expenses [Member]
Restructuring Cost and Reserve [Line Items]
Provision	$ 41

- Definition

+ References

+ Details

Exit and Disposal Costs - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Enhanced benefit charges	$ 115
Additional facility exit costs	40
Additional depreciation expense	80
Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Enhanced benefit charges	68
Exploration and Production [Member]
Restructuring Cost and Reserve [Line Items]
Enhanced benefit charges	21
Corporate and Other [Member]
Restructuring Cost and Reserve [Line Items]
Enhanced benefit charges	$ 26

Dispositions - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Cash proceeds from asset sales			$ 1,326	$ 132
Azeri-Chirag-Guneshli (ACG) fields [Member]
Corporation's proportionate interest in oil and gas assets (in percentage)			3.00%
Baku-Tbilisi-Ceyhan (BTC) pipeline [Member]
Corporation's proportionate interest in oil and gas assets (in percentage)			2.00%
Beryl Fields And Scottish Area Gas Evacuation System (SAGE) [Member]
Cash proceeds from asset sales	$ 442
Gain on asset sale, after-tax	323
Goodwill written off related to sale of business unit	$ 48
Baku-Tbilisi-Ceyhan pipeline and Azeri-Chirag-Guneshli fields [Member]
Cash proceeds from asset sales			$ 884
Gain on asset sale, after-tax			360
Goodwill written off related to sale of business unit			$ 52
Snohvit [Member]
Corporation's proportionate interest in oil and gas assets (in percentage)		3.00%
Cash proceeds from asset sales		$ 132
Gain on asset sale, after-tax		36
Goodwill written off related to sale of business unit		$ 14

Inventories - Inventories (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Crude oil and other charge stocks	$ 284	$ 493
Refined petroleum products and natural gas		1,362
Less:LIFO		(1,123)
Total net crude oil, natural gas and refined petroleum product inventories	284	732
Merchandise, materials and supplies	402	527
Total inventories	$ 686	$ 1,259

Inventories - Additional Information (Detail) $ in Millions	3 Months Ended
Inventories - Additional Information (Detail) $ in Millions	Mar. 31, 2013 USD ($)
Inventory Disclosure [Abstract]
Effect of LIFO inventory liquidations following the cessation of refining operations at the Port Reading facility	$ 218
Effect of LIFO inventory liquidations following the cessation of refining operations at the Port Reading facility, after income taxes	$ 137

Property, Plant and Equipment - Exploration and Production - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2013	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Capitalized Exploratory [Line Items]
Cash proceeds on sale of interests		$ 1,326	$ 132
GOODWILL		1,869		$ 2,208
Assets retirement obligations and deferred income taxes reported in liabilities associated with assets held for sale		3,064		539
Eagle Ford Shale in Texas [Member]
Capitalized Exploratory [Line Items]
Cash proceeds on sale of interests		265
Exploration and Production [Member]
Capitalized Exploratory [Line Items]
Carrying amount of properties classified as held for sale		2,752
GOODWILL		339
Assets retirement obligations and deferred income taxes reported in liabilities associated with assets held for sale		$ 454
Azeri Chirag Guneshli Fields Baku Tbilisi Ceyhan Pipeline And Beryl Fields [Member]
Capitalized Exploratory [Line Items]
GOODWILL				100
Project [Member]
Capitalized Exploratory [Line Items]
Carrying amount of properties classified as held for sale				1,092
Assets retirement obligations and deferred income taxes reported in liabilities associated with assets held for sale				$ 539
Subsequent Events [Member] \| Samara-Nafta [Member]
Capitalized Exploratory [Line Items]
Corporation's proportionate interest in oil and gas assets (in percentage)	90.00%
Cash proceeds on sale of interests	$ 2,050
Ownership interest in subsidiary	100.00%
After-tax proceeds on sale of interests	$ 1,900
Pailin [Member] \| Thailand [Member]
Capitalized Exploratory [Line Items]
Corporation's proportionate interest in oil and gas assets (in percentage)		15.00%
Sinphuhorm [Member] \| Thailand [Member]
Capitalized Exploratory [Line Items]
Corporation's proportionate interest in oil and gas assets (in percentage)		35.00%
Pangkah [Member] \| Indonesia [Member]
Capitalized Exploratory [Line Items]
Corporation's proportionate interest in oil and gas assets (in percentage)		75.00%
Natuna [Member] \| Indonesia [Member]
Capitalized Exploratory [Line Items]
Corporation's proportionate interest in oil and gas assets (in percentage)		23.00%

Property, Plant and Equipment - Net Changes in Capitalized Exploratory Well Costs (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($)
Extractive Industries [Abstract]
Beginning Balance	$ 2,259
Additions to capitalized exploratory well costs pending the determination of proved reserves	100
Reclassifications to wells, facilities and equipment based on the determination of proved reserves	(4)
Capitalized exploratory well costs charged to expense	(2)
Dispositions	(78)
Ending Balance	$ 2,275

Property, Plant and Equipment - Capitalized Exploratory Well Costs - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2013 Well	Mar. 31, 2013 USD ($)	Mar. 31, 2012
Capitalized Exploratory [Line Items]
Exploratory dry hole costs which were incurred and subsequently expensed		$ 28
Capitalized exploratory well costs greater than one year old after completion of drilling		$ 1,771
Capitalized well costs in excess of one year attributable to Block WA-390-P, offshore Western Australia		37.00%
Capitalized well costs attributable to Pony project		37.00%
Capitalized well costs attributable to Area 54 offshore Libya			15.00%
Stampede [Member]
Capitalized Exploratory [Line Items]
Working interest in the blocks		20.00%
Ghana [Member]
Capitalized Exploratory [Line Items]
Capitalized well costs attributable to Ghana	7.00%
Number of consecutive successful exploration wells \| Well	7

Goodwill - Changes in Carrying Amount of Goodwill (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Balance at beginning of period	$ 2,208
Reclassified to Assets held for sale	(339)
Balance at end of period	$ 1,869

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Debt - Additional Information (Detail) $ in Millions	3 Months Ended
Debt - Additional Information (Detail) $ in Millions	Mar. 31, 2013 USD ($)
Debt Disclosure [Abstract]
Net repayments of debt	$ 728
Repayments under revolving credit facility	713
Repayments under short-term facilities	200
Borrowings under asset-backed facility	185
Repayments relating to other debt	24
Facilities classified as short-term debt	$ 1,620

Foreign Currency - Pre-Tax Foreign Currency Gains (Losses) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Foreign Currency [Abstract]
Pre-tax foreign currency gains (losses)	$ (31)	$ 21

- Definition

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

+ References + Details

Retirement Plans - Components of Net Periodic Pension Cost (Detail) - Pension plans [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 20	$ 18
Interest cost	22	22
Expected return on plan assets	(33)	(29)
Amortization of net loss	21	21
Pension expense	$ 30	$ 32

- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512136

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512171

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References + Details

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a, h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Retirement Plans - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($)
Compensation And Retirement Disclosure [Abstract]
Reduction of accrued benefit plan liabilities and pre-tax unrecognized actuarial losses	$ 245
Estimated pension expense for 2013	80
Estimated amortization of unrecognized net actuarial losses for 2013	60
Budgeted contributions to funded pension plans in 2013	140
Corporation contributed to its pension plans	$ 40

Weighted Average Common Shares - Net Income and Weighted Average Number of Common Shares Used in Basic and Diluted Earnings Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Income from continuing operations, net of income taxes	$ 1,183	$ 539
Less: Net income (loss) attributable to noncontrolling interests	7	6
Net income from continuing operations attributable to Hess Corporation	1,176	533
Income from discontinued operations, net of income taxes	90	21
Less: Net income (loss) attributable to noncontrolling interests	(10)	9
Net income from discontinued operations attributable to Hess Corporation	100	12
NET INCOME ATTRIBUTABLE TO HESS CORPORATION	$ 1,276	$ 545
Weighted average common shares outstanding:
Basic	339.2	338.0
Effect of dilutive securities
Restricted common stock	1.3	1.0
Stock options	1.3	1.3
Performance share units	0.8
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING (DILUTED)	342.6	340.3
Basic
Continuing operations	$ 3.47	$ 1.58
Discontinued operations	0.29	0.03
NET INCOME PER SHARE	3.76	1.61
Diluted
Continuing operations	3.43	1.57
Discontinued operations	0.29	0.03
NET INCOME PER SHARE	$ 3.72	$ 1.60

Weighted Average Common Shares - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Restricted stock granted	1,199,332	1,509,752
Performance shares granted	279,093	415,773
Out-of-the money stock options	6,077,460	6,641,000

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment Information - Corporation's Results by Operating Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income (loss) attributable to Hess Corporation:
Net income (loss) attributable to Hess Corporation	$ 1,176	$ 533
Discontinued operations	100	12
Total	1,276	545
Exploration and Production [Member]
Operating revenues from continuing operations	3,466	2,896
Net income (loss) attributable to Hess Corporation:
Net income (loss) attributable to Hess Corporation	1,286	635
Corporate and Other [Member]
Net income (loss) attributable to Hess Corporation:
Net income (loss) attributable to Hess Corporation	(110)	(102)
Discontinued Downstream Business [Member]
Net income (loss) attributable to Hess Corporation:
Discontinued operations	$ 100	$ 12

- Definition

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.13)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph b(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details

Segment Information - Identifiable Assets by Operating Segment (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Assets	$ 42,379	$ 43,441
Exploration and Production [Member]
Assets	36,941	37,687
Corporate and Other [Member]
Assets	484	813
Discontinued Downstream Business [Member] \| Discontinued operations [Member]
Assets	$ 4,954	$ 4,941

Risk Management and Trading Activities - Trading Activities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013
Derivative [Line Items]
Voting interest in trading partnership	50.00%
Percentage of information disclosed for trading partnership	100.00%
Trading Activities [Member]
Derivative [Line Items]
Voting interest in trading partnership	50.00%

Risk Management and Trading Activities - Gross Volume of Corporation's Derivative Instruments Outstanding (Detail) shares in Millions, $ in Millions	Mar. 31, 2013 USD ($) bbl MWh Mcf shares	Dec. 31, 2012 USD ($) bbl MWh Mcf shares
Derivative [Line Items]
Interest rate swaps (millions of U.S. Dollars)	$ 880	$ 880
Gross volume of derivative contracts outstanding relating to trading activities [Member]
Derivative [Line Items]
Foreign exchange (millions of U.S. Dollars)	178	412
Interest rate swaps (millions of U.S. Dollars)	149	167
Gross volume of the Corporate risk management derivative instruments outstanding [Member]
Derivative [Line Items]
Foreign exchange (millions of U.S. Dollars)	537	1,285
Interest rate swaps (millions of U.S. Dollars)	$ 880	$ 880
Crude oil and refined petroleum products (millions of barrels) [Member] \| Gross volume of the Corporation's energy marketing commodity contracts outstanding [Member]
Derivative [Line Items]
Absolute volume of derivative commodity contracts \| bbl	28	26
Crude oil and refined petroleum products (millions of barrels) [Member] \| Gross volume of derivative contracts outstanding relating to trading activities [Member]
Derivative [Line Items]
Absolute volume of derivative commodity contracts \| bbl	1,516	1,179
Natural gas (millions of mcf) [Member] \| Gross volume of the Corporation's energy marketing commodity contracts outstanding [Member]
Derivative [Line Items]
Absolute volume of derivative commodity contracts \| Mcf	2,913	2,938
Natural gas (millions of mcf) [Member] \| Gross volume of derivative contracts outstanding relating to trading activities [Member]
Derivative [Line Items]
Absolute volume of derivative commodity contracts \| Mcf	3,782	3,377
Electricity (millions of megawatt hours) [Member] \| Gross volume of the Corporation's energy marketing commodity contracts outstanding [Member]
Derivative [Line Items]
Absolute volume of derivative commodity contracts \| MWh	269	278
Electricity (millions of megawatt hours) [Member] \| Gross volume of derivative contracts outstanding relating to trading activities [Member]
Derivative [Line Items]
Absolute volume of derivative commodity contracts \| MWh	12	19
Equity securities (millions of shares) [Member] \| Gross volume of derivative contracts outstanding relating to trading activities [Member]
Derivative [Line Items]
Equity securities (millions of shares) \| shares	16	14
Commodity, primarily crude oil (millions of barrels) [Member] \| Gross volume of the Corporate risk management derivative instruments outstanding [Member]
Derivative [Line Items]
Absolute volume of derivative commodity contracts \| bbl	25	1

Risk Management and Trading Activities - Corporate Risk Management Activities - Additional Information (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2013 USD ($) bbl $ / bbl	Mar. 31, 2012 USD ($)	Dec. 31, 2012 USD ($) bbl $ / bbl
Derivative [Line Items]
Total number of barrels per day hedged based on new Brent crude oil cash flow hedges \| bbl	90,000		120,000
Average price for hedges (per barrel) \| $ / bbl	109.70		107.70
Number of barrels per day hedged crude oil that realized hedge losses \| bbl			24,000
Gain (loss) on ineffectiveness reflected in earnings	$ 1	$ (1)
Gross notional amount of interest rate swaps	880		$ 880
New Brent Crude Hedges [Member]
Derivative [Line Items]
Change in the carrying value of the hedged fixed-rate debt - increase/(decrease)	(5)	(3)
Change in the fair value of interest rate swaps - increase/(decrease)	(5)	(3)
Corporate Risk Management [Member] \| Foreign exchange contracts [Member]
Derivative [Line Items]
Net realized and unrealized pre-tax gains (losses) on foreign exchange contracts	(33)	26
Corporate Risk Management [Member] \| New Brent Crude Hedges [Member]
Derivative [Line Items]
Gain (loss) on ineffectiveness reflected in earnings	15	(11)
Corporate Risk Management [Member] \| Closed & New Brent Crude Hedges [Member]
Derivative [Line Items]
After-tax deferred gains in Accumulated other comprehensive income (loss)	9
Sales and other operating revenues [Member]
Derivative [Line Items]
Realized losses from Exploration and Production hedging activities due to the decrease in sales and other operating revenue	18	244
Realized losses from Exploration and Production hedging activities net of taxes	$ 11	$ 151

Risk Management and Trading Activities - Energy Marketing Risk Management Activities - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivative [Line Items]
The length of time over which the Corporation hedges exposure to variability in future cash flows (in number of years)	One year or less
Maximum duration for the outstanding hedging contracts (in number of years)	3 years
Gain (loss) on ineffectiveness recognized immediately in Income from discontinued operations	$ 1	$ (1)
Energy Marketing Risk Management Activities [Member]
Derivative [Line Items]
After-tax deferred losses in Accumulated other comprehensive income (loss)	18		$ 22
Reclassification of accumulated other comprehensive income/(losses) into Income from discontinued operations over the next twelve months	(11)
Energy Marketing Risk Management Activities [Member] \| Not designated as hedges [Member]
Derivative [Line Items]
Net realized and unrealized pre-tax gains on derivative contracts not designated as hedges	$ 32	$ 55

- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References + Details

Risk Management and Trading Activities - Pre-Tax Gains (Losses) from Trading Activities (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gains (losses) from trading activities	$ (1)	$ 34
Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gains (losses) from trading activities	(7)	33
Other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gains (losses) from trading activities	$ 6	$ 1

Risk Management and Trading Activities - Netting Arrangements on Physical and Financial Derivative Assets and Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Gross Amounts, Assets	$ 3,698	$ 3,353
Physical Derivative and Financial Instruments, Assets	(3,049)	(2,750)
Cash Collateral, Assets	(49)	(34)
Net Amounts Presented in the Consolidated Balance Sheet, Assets	600	569
Gross Amounts Not Offset in the Consolidated Balance Sheet, Assets	(59)	(51)
Net Amount, Assets	541	518
Gross Amounts, Liabilities	(3,681)	(3,322)
Physical Derivative and Financial Instruments, Liabilities	3,049	2,750
Cash Collateral, Liabilities		5
Net Amounts Presented in the Consolidated Balance Sheet, Liabilities	(632)	(567)
Gross Amounts Not Offset in the Consolidated Balance Sheet, Liabilities	59	51
Net Amount, Liabilities	(573)	(516)
Commodity [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts, Assets	3,613	3,253
Physical Derivative and Financial Instruments, Assets	(2,990)	(2,661)
Cash Collateral, Assets	(45)	(34)
Net Amounts Presented in the Consolidated Balance Sheet, Assets	578	558
Gross Amounts Not Offset in the Consolidated Balance Sheet, Assets	(55)	(45)
Net Amount, Assets	523	513
Gross Amounts, Liabilities	(3,668)	(3,312)
Physical Derivative and Financial Instruments, Liabilities	2,990	2,661
Cash Collateral, Liabilities		5
Net Amounts Presented in the Consolidated Balance Sheet, Liabilities	(678)	(646)
Gross Amounts Not Offset in the Consolidated Balance Sheet, Liabilities	55	45
Net Amount, Liabilities	(623)	(601)
Other Member]
Derivatives, Fair Value [Line Items]
Gross Amounts, Liabilities	(13)	(10)
Physical Derivative and Financial Instruments, Liabilities	8	8
Cash Collateral, Liabilities
Net Amounts Presented in the Consolidated Balance Sheet, Liabilities	(5)	(2)
Gross Amounts Not Offset in the Consolidated Balance Sheet, Liabilities	4	6
Net Amount, Liabilities	(1)	4
Counterparty netting [Member]
Derivatives, Fair Value [Line Items]
Physical Derivative and Financial Instruments, Assets	(51)	(81)
Net Amounts Presented in the Consolidated Balance Sheet, Assets	(51)	(81)
Net Amount, Assets	(51)	(81)
Gross Amounts, Liabilities
Physical Derivative and Financial Instruments, Liabilities	51	81
Cash Collateral, Liabilities
Net Amounts Presented in the Consolidated Balance Sheet, Liabilities	51	81
Gross Amounts Not Offset in the Consolidated Balance Sheet, Liabilities
Net Amount, Liabilities	51	81
Interest rate and other [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts, Assets	85	100
Physical Derivative and Financial Instruments, Assets	(8)	(8)
Cash Collateral, Assets	(4)
Net Amounts Presented in the Consolidated Balance Sheet, Assets	73	92
Gross Amounts Not Offset in the Consolidated Balance Sheet, Assets	(4)	(6)
Net Amount, Assets	$ 69	$ 86

Risk Management and Trading Activities - Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Total net derivative contract assets	$ 541	$ 518
Total net derivative contract liabilities	573	516
Discontinued Operations [Member]
Derivative [Line Items]
Total net derivative contract assets	487	483
Total net derivative contract liabilities	$ 628	$ 565

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References + Details

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References + Details

Risk Management and Trading Activities - Gross and Net Fair Values of Corporate and Energy Marketing Risk Management and Trading Derivative Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Accounts Receivable [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts designated as hedging instruments	$ 152	$ 137
Derivative contracts not designated as hedging instruments	3,546	3,216
Gross fair value of derivative contracts	3,698	3,353
Master netting arrangements	(3,049)	(2,750)
Cash collateral (received) posted	(49)	(34)
Net fair value of derivative contracts	600	569
Accounts Receivable [Member] \| Commodity [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts designated as hedging instruments	90	65
Derivative contracts not designated as hedging instruments	3,523	3,188
Accounts Receivable [Member] \| Interest rate and other [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts designated as hedging instruments	62	72
Accounts Receivable [Member] \| Foreign exchange [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts not designated as hedging instruments	9	14
Accounts Receivable [Member] \| Other [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts not designated as hedging instruments	14	14
Accounts Payable [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts designated as hedging instruments	(95)	(126)
Derivative contracts not designated as hedging instruments	(3,586)	(3,196)
Gross fair value of derivative contracts	(3,681)	(3,322)
Master netting arrangements	3,049	2,750
Cash collateral (received) posted		5
Net fair value of derivative contracts	(632)	(567)
Accounts Payable [Member] \| Commodity [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts designated as hedging instruments	(93)	(124)
Derivative contracts not designated as hedging instruments	(3,575)	(3,188)
Accounts Payable [Member] \| Interest rate and other [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts designated as hedging instruments	(2)	(2)
Accounts Payable [Member] \| Foreign exchange [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts not designated as hedging instruments	(3)
Accounts Payable [Member] \| Other [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts not designated as hedging instruments	$ (8)	$ (8)

Risk Management and Trading Activities - Fair Values for Corporation's Net Physical Derivative Financial Assets and Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Assets
Total derivative contracts (Assets)	$ 217	$ 243
Net derivative contracts (Assets)	600	569
Other assets measured at fair value on a recurring basis	31	52
Total assets measured at fair value on a recurring basis	631	621
Liabilities
Total derivative contracts (Liabilities)	(146)	(101)
Net derivative contracts (Liabilities)	(632)	(567)
Other liabilities measured at fair value on a recurring basis	(54)	(42)
Total liabilities measured at fair value on a recurring basis	(686)	(609)
Other fair value measurement disclosures Long-term debt	(6,909)	(8,887)
Commodity [Member]
Assets
Total derivative contracts (Assets)	578	558
Liabilities
Total derivative contracts (Liabilities)	(678)	(646)
Other [Member]
Liabilities
Total derivative contracts (Liabilities)	(5)	(2)
Collateral and counterparty netting [Member]
Assets
Net derivative contracts (Assets)	(51)	(81)
Liabilities
Net derivative contracts (Liabilities)	51	81
Interest rate and other [Member]
Assets
Total derivative contracts (Assets)	73	92
Net derivative contracts (Assets)	73	92
Level 1 [Member]
Assets
Net derivative contracts (Assets)	100	77
Other assets measured at fair value on a recurring basis		5
Total assets measured at fair value on a recurring basis	100	82
Liabilities
Net derivative contracts (Liabilities)	(93)	(61)
Other liabilities measured at fair value on a recurring basis	(54)	(40)
Total liabilities measured at fair value on a recurring basis	(147)	(101)
Level 1 [Member] \| Commodity [Member]
Assets
Total derivative contracts (Assets)	93	94
Liabilities
Total derivative contracts (Liabilities)	(93)	(83)
Level 1 [Member] \| Other [Member]
Liabilities
Total derivative contracts (Liabilities)	(1)	(1)
Level 1 [Member] \| Collateral and counterparty netting [Member]
Assets
Net derivative contracts (Assets)	(1)	(23)
Liabilities
Net derivative contracts (Liabilities)	1	23
Level 1 [Member] \| Interest rate and other [Member]
Assets
Total derivative contracts (Assets)	8	6
Level 2 [Member]
Assets
Net derivative contracts (Assets)	492	477
Other assets measured at fair value on a recurring basis	31	49
Total assets measured at fair value on a recurring basis	523	526
Liabilities
Net derivative contracts (Liabilities)	(552)	(605)
Other liabilities measured at fair value on a recurring basis		(2)
Total liabilities measured at fair value on a recurring basis	(552)	(607)
Other fair value measurement disclosures Long-term debt	(6,909)	(8,887)
Level 2 [Member] \| Commodity [Member]
Assets
Total derivative contracts (Assets)	468	445
Liabilities
Total derivative contracts (Liabilities)	(594)	(657)
Level 2 [Member] \| Other [Member]
Liabilities
Total derivative contracts (Liabilities)	(4)	(2)
Level 2 [Member] \| Collateral and counterparty netting [Member]
Assets
Net derivative contracts (Assets)	(46)	(54)
Liabilities
Net derivative contracts (Liabilities)	46	54
Level 2 [Member] \| Interest rate and other [Member]
Assets
Total derivative contracts (Assets)	70	86
Level 3 [Member]
Assets
Net derivative contracts (Assets)	213	240
Total assets measured at fair value on a recurring basis	213	240
Liabilities
Net derivative contracts (Liabilities)	(143)	(97)
Other liabilities measured at fair value on a recurring basis		(2)
Total liabilities measured at fair value on a recurring basis	(143)	(99)
Level 3 [Member] \| Commodity [Member]
Assets
Total derivative contracts (Assets)	217	243
Liabilities
Total derivative contracts (Liabilities)	(146)	(101)
Level 3 [Member] \| Other [Member]
Liabilities
Total derivative contracts (Liabilities)	(1)
Level 3 [Member] \| Collateral and counterparty netting [Member]
Assets
Net derivative contracts (Assets)	(4)	(4)
Liabilities
Net derivative contracts (Liabilities)	4	4
Level 3 [Member] \| Interest rate and other [Member]
Assets
Total derivative contracts (Assets)		1
Counterparty netting [Member]
Assets
Net derivative contracts (Assets)	(156)	(191)
Other assets measured at fair value on a recurring basis		(2)
Total assets measured at fair value on a recurring basis	(156)	(193)
Liabilities
Net derivative contracts (Liabilities)	156	191
Other liabilities measured at fair value on a recurring basis		2
Total liabilities measured at fair value on a recurring basis	156	193
Counterparty netting [Member] \| Commodity [Member]
Assets
Total derivative contracts (Assets)	(155)	(190)
Liabilities
Total derivative contracts (Liabilities)	155	190
Counterparty netting [Member] \| Other [Member]
Liabilities
Total derivative contracts (Liabilities)	1	1
Counterparty netting [Member] \| Interest rate and other [Member]
Assets
Total derivative contracts (Assets)	(1)	(1)
Collateral [Member]
Assets
Net derivative contracts (Assets)	(49)	(34)
Total assets measured at fair value on a recurring basis	(49)	(34)
Liabilities
Net derivative contracts (Liabilities)		5
Total liabilities measured at fair value on a recurring basis		5
Collateral [Member] \| Commodity [Member]
Assets
Total derivative contracts (Assets)	(45)	(34)
Liabilities
Total derivative contracts (Liabilities)		$ 5
Collateral [Member] \| Interest rate and other [Member]
Assets
Total derivative contracts (Assets)	$ (4)

Risk Management and Trading Activities - Fair Values for Corporation's Net Physical Derivative Financial Assets and Liabilities (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Total assets measured at fair value on a recurring basis	$ 631	$ 621
Total liabilities measured at fair value on a recurring basis	686	$ 609
Corporate Risk Management Activities [Member] \| Other Member] \| Level 2 liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Total liabilities measured at fair value on a recurring basis	4
Commodity And Interest Rate And Other [Member] \| Corporate Risk Management Activities [Member] \| Level 2 assets [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Total assets measured at fair value on a recurring basis	$ 113

Risk Management and Trading Activities - Net Transfers into and out of Each Level of Fair Value Hierarchy (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements net transfers in	$ (1)	$ 4
Fair value measurements net transfers out		(9)
Fair value measurements net transfers into/out of	(1)	(5)
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements net transfers in		49
Fair value measurements net transfers out	(1)	(19)
Fair value measurements net transfers into/out of	(1)	30
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements net transfers in	2	27
Fair value measurements net transfers out		(52)
Fair value measurements net transfers into/out of	$ 2	$ (25)

Risk Management and Trading Activities - Changes in Physical Derivative and Financial Assets and Liabilities that are Measured at Fair Value Based on Level 3 Inputs (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Fair Value Disclosures [Abstract]
Balance at beginning of period	$ 141	$ (143)
Unrealized pre-tax gains (losses)	(63)	(123)
Purchases	28	220
Sales	(23)	(234)
Settlements	(15)	37
Transfers into Level 3	2	27
Transfers out of Level 3		(52)
Balance at end of period	$ 70	$ (268)

Risk Management and Trading Activities - Corporation's Unobservable Inputs Used in Fair Value Measurements (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Total derivative contracts (Assets)	$ 217	$ 243
Total derivatives contract (liabilities)	$ 146	$ 101

Risk Management and Trading Activities - Credit Risk - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Cash held from counterparties	$ 49	$ 34
Cash posted to counterparties	0	$ 5
Outstanding letters of credit	542
Cash collateral posted for derivatives with contingent collateral provisions	0
Additional collateral	$ 85
Integrated Oil Companies [Member]
Derivative [Line Items]
Accounts receivable - Trade	40.00%
Refiners [Member]
Derivative [Line Items]
Accounts receivable - Trade	27.00%
Government Entities [Member]
Derivative [Line Items]
Accounts receivable - Trade	24.00%
Financial Institutions [Member]
Derivative [Line Items]
Accounts receivable - Trade	7.00%
Discontinued Operations [Member]
Derivative [Line Items]
Net liability related to derivatives with contingent collateral provisions	$ 130
Outstanding letters of credit	$ 400

Subsequent Events - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2013	Mar. 31, 2013	Mar. 31, 2012
Subsequent Event [Line Items]
Cash proceeds on sale of interests		$ 1,326	$ 132
Subsequent Events [Member] \| Repayments [Member]
Subsequent Event [Line Items]
Repayment of borrowings under credit facilities	$ 1,620
Subsequent Events [Member] \| Samara-Nafta [Member]
Subsequent Event [Line Items]
Ownership interest in subsidiary	100.00%
Cash proceeds on sale of interests	$ 2,050
Corporation's proportionate interest in oil and gas assets (in percentage)	90.00%
After-tax proceeds on sale of interests after working capital and other adjustments	$ 1,900

Risk Management and Trading Activities - Corporation's Unobservable Inputs Used in Fair Value Measurements (Detail)	Mar. 31, 2013 $ / bbl $ / MMBTU $ / MWh	Dec. 31, 2012 $ / bbl $ / MMBTU $ / MWh
Minimum [Member] \| Contract prices [Member] \| Crude oil and refined petroleum products [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Range of measurement of assets for recurring inputs \| $ / bbl	98.30	79.35
Range of measurement of liabilities for recurring inputs \| $ / bbl	97.96	83.49
Minimum [Member] \| Contract prices [Member] \| Electricity [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Range of measurement of assets for recurring inputs \| $ / MWh	26.14	23.37
Range of measurement of liabilities for recurring inputs \| $ / MWh	26.24	25.01
Minimum [Member] \| Contract prices [Member] \| Natural gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Range of measurement of assets for recurring inputs \| $ / MMBTU	(0.40)	(0.47)
Range of measurement of liabilities for recurring inputs \| $ / MMBTU	(0.40)	(0.72)
Minimum [Member] \| Contract volatilities [Member] \| Crude oil and refined petroleum products [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage range of measurement of assets for recurring inputs	15.00%	23.00%
Percentage range of measurement of liabilities for recurring inputs	15.00%	24.00%
Minimum [Member] \| Contract volatilities [Member] \| Electricity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage range of measurement of assets for recurring inputs	17.00%	18.00%
Minimum [Member] \| Contract volatilities [Member] \| Natural gas [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage range of measurement of assets for recurring inputs	21.00%	21.00%
Percentage range of measurement of liabilities for recurring inputs	21.00%	21.00%
Maximum [Member] \| Contract prices [Member] \| Crude oil and refined petroleum products [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Range of measurement of assets for recurring inputs \| $ / bbl	134.65	144.27
Range of measurement of liabilities for recurring inputs \| $ / bbl	135.00	133.38
Maximum [Member] \| Contract prices [Member] \| Electricity [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Range of measurement of assets for recurring inputs \| $ / MWh	90.62	79.27
Range of measurement of liabilities for recurring inputs \| $ / MWh	81.21	72.60
Maximum [Member] \| Contract prices [Member] \| Natural gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Range of measurement of assets for recurring inputs \| $ / MMBTU	5.80	6.66
Range of measurement of liabilities for recurring inputs \| $ / MMBTU	5.88	6.66
Maximum [Member] \| Contract volatilities [Member] \| Crude oil and refined petroleum products [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage range of measurement of assets for recurring inputs	19.00%	27.00%
Percentage range of measurement of liabilities for recurring inputs	19.00%	27.00%
Maximum [Member] \| Contract volatilities [Member] \| Electricity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage range of measurement of assets for recurring inputs	34.00%	40.00%
Maximum [Member] \| Contract volatilities [Member] \| Natural gas [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage range of measurement of assets for recurring inputs	30.00%	36.00%
Percentage range of measurement of liabilities for recurring inputs	30.00%	28.00%
Weighted Average [Member] \| Contract prices [Member] \| Crude oil and refined petroleum products [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Range of measurement of assets for recurring inputs \| $ / bbl	120.61	113.06
Range of measurement of liabilities for recurring inputs \| $ / bbl	116.42	109.94
Weighted Average [Member] \| Contract prices [Member] \| Electricity [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Range of measurement of assets for recurring inputs \| $ / MWh	45.83	40.81
Range of measurement of liabilities for recurring inputs \| $ / MWh	48.23	40.38
Weighted Average [Member] \| Contract prices [Member] \| Natural gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Range of measurement of assets for recurring inputs \| $ / MMBTU	0.31	0.39
Range of measurement of liabilities for recurring inputs \| $ / MMBTU	0.80	1.26
Weighted Average [Member] \| Contract volatilities [Member] \| Crude oil and refined petroleum products [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage range of measurement of assets for recurring inputs	16.00%	26.00%
Percentage range of measurement of liabilities for recurring inputs	16.00%	26.00%
Weighted Average [Member] \| Contract volatilities [Member] \| Electricity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage range of measurement of assets for recurring inputs	24.00%	28.00%
Weighted Average [Member] \| Contract volatilities [Member] \| Natural gas [Member] \| Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage range of measurement of assets for recurring inputs	23.00%	25.00%
Percentage range of measurement of liabilities for recurring inputs	21.00%	22.00%