CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Revenues and Other
Natural-gas sales	$ 2,444		$ 3,300	$ 3,420
Oil and condensate sales	8,728		8,072	5,592
Natural-gas liquids sales	1,224		1,462	997
Gathering, processing, and marketing sales	911		1,048	833
Gains (losses) on divestitures and other, net	104		85	142
Total	13,411		13,967	10,984
Costs and Expenses
Oil and gas operating	976		993	830
Oil and gas transportation and other	955		891	816
Exploration	1,946		1,076	974
Gathering, processing, and marketing	763		791	615
General and administrative	1,246		1,060	967
Depreciation, depletion, and amortization	3,964		3,830	3,714
Other taxes	1,224		1,492	1,068
Impairments	389		1,774	216
Algeria exceptional profits tax settlement	(1,797)	[1]
Deepwater Horizon settlement and related costs	18		3,930	15
Total	9,684		15,837	9,215
Operating Income (Loss)	3,727		(1,870)	1,769
Other (Income) Expense
Interest expense	742		839	855
(Gains) losses on derivatives, net	(326)		461	(608)
Other (income) expense, net	(254)		254	(119)
Total	162		1,554	128
Income (Loss) Before Income Taxes	3,565		(3,424)	1,641
Income Tax Expense (Benefit)	1,120		(856)	820
Net Income (Loss)	2,445		(2,568)	821
Net Income Attributable to Noncontrolling Interests	54		81	60
Net Income (Loss) Attributable to Common Stockholders	$ 2,391		$ (2,649)	$ 761
Per Common Share
Net income (loss) attributable to common stockholders - basic	$ 4.76		$ (5.32)	$ 1.53
Net income (loss) attributable to common stockholders - diluted	$ 4.74		$ (5.32)	$ 1.52
Average Number of Common Shares Outstanding - Basic	500		498	495
Average Number of Common Shares Outstanding - Diluted	502		498	497
Dividends (per Common Share)	$ 0.36		$ 0.36	$ 0.36

[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.