CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues and Other
Natural-gas sales	$ 830	$ 805	$ 3,038	$ 2,547
Oil and condensate sales	2,637	2,389	7,766	6,761
Natural-gas liquids sales	424	325	1,221	889
Gathering, processing, and marketing sales	339	270	928	750
Gains (losses) on divestitures and other, net	780	64	2,340	296
Total	5,010	3,853	15,293	11,243
Costs and Expenses
Oil and gas operating	275	277	861	769
Oil and gas transportation and other	322	255	869	763
Exploration	199	272	1,000	714
Gathering, processing, and marketing	269	217	771	638
General and administrative	381	255	984	787
Depreciation, depletion, and amortization	1,163	996	3,335	2,958
Other taxes	306	294	981	819
Impairments	394	593	514	632
Algeria exceptional profits tax settlement	0	0	0	33
Deepwater Horizon settlement and related costs	3	5	96	12
Total	3,312	3,164	9,411	8,125
Operating Income (Loss)	1,698	689	5,882	3,118
Other (Income) Expense
Interest expense	204	177	573	513
Statement [Line Items]
(Gains) losses on derivatives, net	(324)	64	462	(396)
Other (income) expense, net	24	(23)	12	69
Tronox-related contingent loss	19	0	4,338	0
Total	(76)	226	5,376	189
Income (Loss) Before Income Taxes	1,774	463	506	2,929
Income tax expense (benefit)	627	240	1,719	1,263
Net Income (Loss)	1,147	223	(1,213)	1,666
Net income attributable to noncontrolling interests	60	41	142	95
Net Income (Loss) Attributable to Common Stockholders	1,087	182	(1,355)	1,571
Per Common Share
Net income (loss) attributable to common stockholders—basic	$ 2.13	$ 0.36	$ (2.69)	$ 3.11
Net income (loss) attributable to common stockholders—diluted	$ 2.12	$ 0.36	$ (2.69)	$ 3.10
Average Number of Common Shares Outstanding—Basic	506	503	505	502
Average Number of Common Shares Outstanding—Diluted	508	505	505	504
Dividends (per common share)	$ 0.27	$ 0.18	$ 0.72	$ 0.36
Commodity Contract and Interest Rate Swap [Member]
Statement [Line Items]
(Gains) losses on derivatives, net	$ (323)	$ 72	$ 453	$ (393)