CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Revenues and Other
Natural-gas sales	$ 840		$ 809		$ 2,564		$ 2,692
Oil and condensate sales	1,905		1,298		5,948		4,138
Natural-gas liquids sales	377		227		1,080		736
Gathering, processing, and marketing sales	262		182		750		643
Gains (losses) on divestitures and other, net	(185)		34		(214)		84
Total	3,199		2,550		10,128		8,293
Costs and Expenses
Oil and gas operating	262		207		730		590
Oil and gas transportation and other	217		220		633		607
Exploration	307		296		722		649
Gathering, processing, and marketing	214		134		590		466
General and administrative	293		273		806		686
Depreciation, depletion, and amortization	932		962		2,902		2,845
Other taxes	375		240		1,132		809
Impairments	183		20		287		147
Deepwater Horizon settlement and related costs	4,042	[1]	2	[1]	4,055	[1]	2	[1]
Total	6,825		2,354		11,857		6,801
Operating Income (Loss)	(3,626)		196		(1,729)		1,492
Other (Income) Expense
Interest expense	206		218		642		642
Other (income) expense, net	40		(129)		(2)		(106)
Total	870		110		1,262		140
Income (Loss) Before Income Taxes	(4,496)		86		(2,991)		1,352
Income Tax Expense (Benefit)	(1,468)		94		(762)		660
Net Income (Loss)	(3,028)		(8)		(2,229)		692
Net Income Attributable to Noncontrolling Interests	23		18		62		42
Net Income (Loss) Attributable to Common Stockholders	(3,051)		(26)		(2,291)		650
Per Common Share:
Net income (loss) attributable to common stockholders - basic	$ (6.12)		$ (0.05)		$ (4.60)		$ 1.30
Net income (loss) attributable to common stockholders - diluted	$ (6.12)		$ (0.05)		$ (4.60)		$ 1.30
Average Number of Common Shares Outstanding - Basic	498		496		498		495
Average Number of Common Shares Outstanding - Diluted	498		496		498		496
Dividends (per Common Share)	$ 0.09		$ 0.09		$ 0.27		$ 0.27
Commodity Contract [Member] | (Gains) Losses on Commodity Derivatives, Net [Member]
(Gains) losses on derivative instruments, net	(230)		(200)		(317)		(1,052)
Interest Rate Contract and Other [Member] | (Gains) Losses on Other Derivatives, Net [Member]
(Gains) losses on derivative instruments, net	$ 854		$ 221		$ 939		$ 656

[1] In the third quarter of 2011, the Company revised the definition of Adjusted EBITDAX to exclude the Deepwater Horizon settlement and related costs. The prior periods have been adjusted to reflect this change.