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 income:
Sales and other operating revenues, including related party	$ 3,119	$ 3,405	$ 9,978	$ 9,324
Marketing revenues	668	631	1,597	2,237
Income from equity method investments	114	122	309	260
Net gain (loss) on disposal of assets	(6)	(12)	(4)	126
Other income	19	15	38	38
Total revenues and other income	3,914	4,161	11,918	11,985
Costs and expenses:
Production	575	601	1,767	1,581
Marketing, including purchases from related parties	664	629	1,588	2,238
Other operating	126	112	323	311
Exploration	153	170	751	477
Depreciation, depletion and amortization	720	625	2,205	1,779
Impairments	11	8	49	271
Taxes other than income	91	55	268	178
General and administrative	152	179	490	499
Total costs and expenses	2,492	2,379	7,441	7,334
Income from operations	1,422	1,782	4,477	4,651
Net interest and other	(66)	(53)	(209)	(160)
Income before income taxes	1,356	1,729	4,268	4,491
Provision for income taxes	787	1,279	2,890	3,231
Net income	$ 569	$ 450	$ 1,378	$ 1,260
Basic:
Net income, per basic share	$ 0.80	$ 0.64	$ 1.95	$ 1.79
Diluted:
Net income, per diluted share	$ 0.80	$ 0.63	$ 1.94	$ 1.78
Dividends paid, per share	$ 0.19	$ 0.17	$ 0.53	$ 0.51
Weighted average common shares outstanding, basic	707	706	708	705
Weighted average common shares outstanding, diluted	711	709	712	709