CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues and Other
Natural-gas sales	$ 641	$ 1,217
Oil and condensate sales	1,419	2,424
Natural-gas liquids sales	232	386
Gathering, processing, and marketing sales	293	311
Gains (losses) on divestitures and other, net	(264)	1,506
Total	2,321	5,844
Costs and Expenses
Oil and gas operating	296	313
Oil and gas transportation and other	361	266
Exploration	1,083	299
Gathering, processing, and marketing	254	252
General and administrative	310	298
Depreciation, depletion, and amortization	1,256	1,124
Other taxes	182	314
Impairments	2,783	3
Total	6,529	2,869
Operating Income (Loss)	(4,208)	2,975
Other (Income) Expense
Interest expense	216	183
(Gains) losses on derivatives, net	152	461
Other (income) expense, net	47	1
Total	420	4,937
Income (Loss) Before Income Taxes	(4,628)	(1,962)
Income tax expense (benefit)	(1,392)	664
Net Income (Loss)	(3,236)	(2,626)
Net income attributable to noncontrolling interests	32	43
Net Income (Loss) Attributable to Common Stockholders	(3,268)	(2,669)
Per Common Share
Net income (loss) attributable to common stockholders—basic	$ (6.45)	$ (5.30)
Net income (loss) attributable to common stockholders—diluted	$ (6.45)	$ (5.30)
Average Number of Common Shares Outstanding—Basic	507	504
Average Number of Common Shares Outstanding—Diluted	507	504
Dividends (per common share)	$ 0.27	$ 0.18
Commodity Contract and Interest Rate Swap [Member]
Other (Income) Expense
(Gains) losses on derivatives, net	152	453
Deepwater Horizon [Member] | Pending Litigation [Member]
Costs and Expenses
Litigation-related contingent loss	4	0
Tronox Litigation [Member] | Judicial Ruling [Member]
Costs and Expenses
Litigation-related contingent loss	$ 5	$ 4,300