CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Revenues and Other
Natural-gas sales	$ 3,300		$ 3,420		$ 2,924
Oil and condensate sales	8,072		5,592		4,022
Natural-gas liquids sales	1,462		997		536
Gathering, processing, and marketing sales	1,048		833		728
Gains (losses) on divestitures and other, net	85		142		133
Reversal of accrual for Deepwater Royalty Relief Act dispute					657
Total	13,967		10,984		9,000
Costs and Expenses
Oil and gas operating	993		830		859
Oil and gas transportation and other	891		816		664
Exploration	1,076		974		1,107
Gathering, processing, and marketing	791		615		617
General and administrative	1,060		967		983
Depreciation, depletion, and amortization	3,830		3,714		3,532
Other taxes	1,492		1,068		746
Impairments	1,774		216		115
Deepwater Horizon settlement and related costs	3,930	[1]	15	[1]
Total	15,837		9,215		8,623
Operating Income (Loss)	(1,870)		1,769		377
Other (Income) Expense
Interest expense	839		855		702
Other (income) expense, net	254		(119)		(43)
Total	1,554		128		485
Income (Loss) Before Income Taxes	(3,424)		1,641		(108)
Income Tax Expense (Benefit)	(856)		820		(5)
Net Income (Loss)	(2,568)		821		(103)
Net Income Attributable to Noncontrolling Interests	81		60		32
Net Income (Loss) Attributable to Common Stockholders	(2,649)		761		(135)
Per Common Share:
Net income (loss) attributable to common stockholders - basic	$ (5.32)		$ 1.53		$ (0.28)
Net income (loss) attributable to common stockholders - diluted	$ (5.32)		$ 1.52		$ (0.28)
Average Number of Common Shares Outstanding - Basic	498		495		480
Average Number of Common Shares Outstanding - Diluted	498		497		480
Dividends (per Common Share)	$ 0.36		$ 0.36		$ 0.36
Commodity Contract [Member] | (Gains) Losses on Commodity Derivatives, Net [Member]
(Gains) losses on derivative instruments, net	(562)		(893)		408
Interest Rate Contract and Other [Member] | (Gains) Losses on Other Derivatives, Net [Member]
(Gains) losses on derivative instruments, net	$ 1,023		$ 285		$ (582)

[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.