CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011
(Gains) losses on derivative instruments, net	$ 259		$ 622	$ (59)		$ 631
Revenues and Other
Natural-gas sales	613		840	1,682		2,564
Oil and condensate sales	2,163		1,905	6,629		5,948
Natural-gas liquids sales	289		377	913		1,080
Gathering, processing, and marketing sales	218		262	671		750
Gains (losses) on divestitures and other, net	49		(185)	106		(214)
Total	3,332		3,199	10,001		10,128
Costs and Expenses
Oil and gas operating	241		262	732		730
Oil and gas transportation and other	247		217	710		633
Exploration	297		307	1,662		722
Gathering, processing, and marketing	185		214	552		590
General and administrative	285		293	816		784
Depreciation, depletion, and amortization	979		932	2,936		2,902
Other taxes	267		375	970		1,132
Impairments	4		183	166		287
Algeria exceptional profits tax settlement	7	[1]		(1,797)	[1]
Deepwater Horizon settlement and related costs	4		4,042	15		4,077
Total	2,516		6,825	6,762		11,857
Operating Income (Loss)	816		(3,626)	3,239		(1,729)
Other (Income) Expense
Interest expense	185		206	561		642
Other (income) expense, net	(10)		40	(264)		(2)
Total	426		870	220		1,262
Income (Loss) Before Income Taxes	390		(4,496)	3,019		(2,991)
Income Tax Expense (Benefit)	248		(1,468)	764		(762)
Net Income (Loss)	142		(3,028)	2,255		(2,229)
Net Income Attributable to Noncontrolling Interests	21		23	67		62
Net Income (Loss) Attributable to Common Stockholders	121		(3,051)	2,188		(2,291)
Per Common Share
Net income (loss) attributable to common stockholders - basic	$ 0.24		$ (6.12)	$ 4.35		$ (4.60)
Net income (loss) attributable to common stockholders - diluted	$ 0.24		$ (6.12)	$ 4.34		$ (4.60)
Average Number of Common Shares Outstanding - Basic	500		498	499		498
Average Number of Common Shares Outstanding - Diluted	502		498	501		498
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	237		(230)	(231)		(317)
Interest Rate Contract and Other [Member] | (Gains) Losses on Other Derivatives, net [Member]
(Gains) losses on derivative instruments, net	$ 14		$ 854	$ 154		$ 939

[1] In the first quarter of 2012, the Company revised the definition of Adjusted EBITDAX to exclude Algeria exceptional profits tax settlement, Tronox-related contingent loss, and realized (gains) losses on other derivatives, net. Prior periods have been adjusted to reflect this change.