CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues and Other
Natural-gas sales	$ 1,217	$ 807
Oil and condensate sales	2,424	2,377
Natural-gas liquids sales	386	303
Gathering, processing, and marketing sales	311	231
Gains (losses) on divestitures and other, net	1,506	175
Total	5,844	3,893
Costs and Expenses
Oil and gas operating	313	247
Oil and gas transportation and other	266	255
Exploration	299	264
Gathering, processing, and marketing	252	199
General and administrative	298	275
Depreciation, depletion, and amortization	1,124	1,022
Other taxes	314	280
Impairments	3	29
Algeria exceptional profits tax settlement	0	33
Total	2,869	2,604
Operating Income (Loss)	2,975	1,289
Other (Income) Expense
Interest expense	183	164
Statement [Line Items]
(Gains) losses on derivatives, net	461	199
Other (income) expense, net	1	(6)
Tronox-related contingent loss	4,300	0
Total	4,937	349
Income (Loss) Before Income Taxes	(1,962)	940
Income tax expense (benefit)	664	456
Net Income (Loss)	(2,626)	484
Net income attributable to noncontrolling interests	43	24
Net Income (Loss) Attributable to Common Stockholders	(2,669)	460
Per Common Share
Net income (loss) attributable to common stockholders—basic	$ (5.30)	$ 0.91
Net income (loss) attributable to common stockholders—diluted	$ (5.30)	$ 0.91
Average Number of Common Shares Outstanding—Basic	504	501
Average Number of Common Shares Outstanding—Diluted	504	503
Dividends (per Common Share)	$ 0.18	$ 0.09
Commodity Contract and Interest Rate Swap [Member]
Statement [Line Items]
(Gains) losses on derivatives, net	$ 453	$ 191