CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues and Other
Natural-gas sales	$ 807	$ 573
Oil and condensate sales	2,377	2,244
Natural-gas liquids sales	303	342
Gathering, processing, and marketing sales	231	253
Gains (losses) on divestitures and other, net	175	35
Total	3,893	3,447
Costs and Expenses
Oil and gas operating	247	242
Oil and gas transportation and other	255	240
Exploration	264	244
Gathering, processing, and marketing	199	189
General and administrative	272	269
Depreciation, depletion, and amortization	1,022	930
Other taxes	280	377
Impairments	29	50
Algeria exceptional profits tax settlement	33	(1,804)
Deepwater Horizon settlement and related costs	3	8
Total	2,604	745
Operating Income (Loss)	1,289	2,702
Other (Income) Expense
Interest expense	164	186
(Gains) losses on derivatives, net	191	(284)
Other (income) expense, net	(6)	265
Total	349	167
Income (Loss) Before Income Taxes	940	2,535
Income tax expense (benefit)	456	352
Net Income (Loss)	484	2,183
Net income attributable to noncontrolling interests	24	27
Net Income (Loss) Attributable to Common Stockholders	$ 460	$ 2,156
Per Common Share
Net income (loss) attributable to common stockholders - basic	$ 0.91	$ 4.30
Net income (loss) attributable to common stockholders - diluted	$ 0.91	$ 4.28
Average Number of Common Shares Outstanding - Basic	501	499
Average Number of Common Shares Outstanding - Diluted	503	501
Dividends (per Common Share)	$ 0.09	$ 0.09