Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues and other income:
Revenues from contracts with customers	$ 5,063	$ 5,902	$ 4,247
Net loss on commodity derivatives	(72)	(14)	(36)
Income from equity method investments	87	225	256
Net gain on disposal of assets	50	319	58
Other income	62	150	78
Total revenues and other income	5,190	6,582	4,765
Costs and expenses:
Production	712	842	716
Shipping, handling and other operating	605	575	431
Exploration	149	289	409
Depreciation, depletion and amortization	2,397	2,441	2,372
Impairments	24	75	229
Taxes other than income	311	299	183
General and administrative	356	394	371
Total costs and expenses	4,554	4,915	4,879
Income (loss) from operations	636	1,667	(114)
Net interest and other	(244)	(226)	(270)
Other net periodic benefit costs	3	(14)	(19)
Loss on early extinguishment of debt	(3)	0	(51)
Income (loss) from continuing operations before income taxes	392	1,427	(454)
Provision (benefit) for income taxes	(88)	331	376
Income (loss) from continuing operations	480	1,096	(830)
Loss from discontinued operations	0	0	(4,893)
Net income (loss)	$ 480	$ 1,096	$ (5,723)
Basic:
Income from continuing operations (in dollars per basic share)	$ 0.59	$ 1.30	$ (0.97)
Discontinued operations (in dollars per basic share)	0	0	(5.76)
Net income (in dollars per basic share)	0.59	1.30	(6.73)
Diluted:
Income from continuing operations (in dollars per diluted share)	0.59	1.29	(0.97)
Discontinued operations (in dollars per diluted share)	0	0	(5.76)
Net income (in dollars per diluted share)	$ 0.59	$ 1.29	$ (6.73)
Weighted average shares:
Basic	810	846	850
Diluted	810	847	850
Marketing revenues
Revenues and other income:
Revenues from contracts with customers	$ 0	$ 0	$ 162
Costs and expenses:
Marketing, including purchases from related parties	$ 0	$ 0	$ 168