Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues and other income:
Sales and other operating revenues	$ 4,018	$ 3,633	$ 11,513	$ 10,969
Sales to related parties	16	16	43	45
Income from equity method investments	122	123	260	360
Net gain (loss) on disposal of assets	(12)	13	126	63
Other income	17	14	43	36
Total revenues and other income	4,161	3,799	11,985	11,473
Costs and expenses:
Cost of revenues (excludes items below)	1,296	1,600	4,005	4,671
Purchases from related parties	72	57	191	184
Depreciation, depletion and amortization	625	517	1,779	1,716
Impairments	8	0	271	307
General and administrative expenses	139	104	389	371
Other taxes	63	59	208	170
Exploration expenses	176	129	491	504
Total costs and expenses	2,379	2,466	7,334	7,923
Income from operations	1,782	1,333	4,651	3,550
Net interest and other	(53)	(30)	(160)	(62)
Loss on early extinguishment of debt	0	0	0	(279)
Income from continuing operations before income taxes	1,729	1,303	4,491	3,209
Provision for income taxes	1,279	898	3,231	2,051
Income from continuing operations	450	405	1,260	1,158
Discontinued operations	0	0	0	1,239
Net income	$ 450	$ 405	$ 1,260	$ 2,397
Basic:
Income from continuing operations, per basic share	$ 0.64	$ 0.57	$ 1.79	$ 1.63
Discontinued operations, per basic share	$ 0	$ 0.00	$ 0	$ 1.74
Net income, per basic share	$ 0.64	$ 0.57	$ 1.79	$ 3.37
Diluted:
Income from continuing operations, per diluted share	$ 0.63	$ 0.57	$ 1.78	$ 1.62
Discontinued operations, per diluted share	$ 0	$ 0.00	$ 0	$ 1.73
Net income, per diluted share	$ 0.63	$ 0.57	$ 1.78	$ 3.35
Dividends paid, per share	$ 0.17	$ 0.15	$ 0.51	$ 0.65
Weighted average common shares outstanding, basic	706	711	705	712
Weighted average common shares outstanding, diluted	709	714	709	716