CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues and Other
Natural-gas sales	$ 805	$ 613	$ 2,547	$ 1,682
Oil and condensate sales	2,389	2,163	6,761	6,629
Natural-gas liquids sales	325	289	889	913
Gathering, processing, and marketing sales	270	218	750	671
Gains (losses) on divestitures and other, net	64	49	296	106
Total	3,853	3,332	11,243	10,001
Costs and Expenses
Oil and gas operating	277	241	769	732
Oil and gas transportation and other	255	247	763	710
Exploration	272	297	714	1,662
Gathering, processing, and marketing	217	185	638	552
General and administrative	255	285	787	816
Depreciation, depletion, and amortization	996	979	2,958	2,936
Other taxes	294	267	819	970
Impairments	593	4	632	166
Algeria exceptional profits tax settlement	0	7	33	(1,797)
Deepwater Horizon settlement and related costs	5	4	12	15
Total	3,164	2,516	8,125	6,762
Operating Income (Loss)	689	816	3,118	3,239
Other (Income) Expense
Interest expense	177	185	513	561
(Gains) losses on derivatives, net	72	251	(393)	(77)
Other (income) expense, net	(23)	(10)	69	(264)
Total	226	426	189	220
Income (Loss) Before Income Taxes	463	390	2,929	3,019
Income tax expense (benefit)	240	248	1,263	764
Net Income (Loss)	223	142	1,666	2,255
Net income attributable to noncontrolling interests	41	21	95	67
Net Income (Loss) Attributable to Common Stockholders	$ 182	$ 121	$ 1,571	$ 2,188
Per Common Share
Net income (loss) attributable to common stockholders—basic	$ 0.36	$ 0.24	$ 3.11	$ 4.35
Net income (loss) attributable to common stockholders—diluted	$ 0.36	$ 0.24	$ 3.10	$ 4.34
Average Number of Common Shares Outstanding—Basic	503	500	502	499
Average Number of Common Shares Outstanding—Diluted	505	502	504	501
Dividends (per Common Share)	$ 0.18	$ 0.09	$ 0.36	$ 0.27