Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues and other income:
Revenues from contracts with customers	$ 761	$ 1,249	$ 2,275	$ 3,830
Net gain (loss) on commodity derivatives	(1)	47	131	(28)
Income (loss) from equity method investments	(10)	21	(174)	63
Net gain on disposal of assets	1	22	8	56
Other income	3	6	16	54
Total revenues and other income	754	1,345	2,256	3,975
Costs and expenses:
Production	129	163	418	543
Shipping, handling and other operating	183	138	432	462
Exploration	27	22	81	107
Depreciation, depletion and amortization	554	622	1,795	1,781
Impairments	1	0	98	24
Taxes other than income	49	81	145	232
General and administrative	53	82	217	263
Total costs and expenses	996	1,108	3,186	3,412
Income (loss) from operations	(242)	237	(930)	563
Net interest and other	(62)	(64)	(195)	(177)
Other net periodic benefit (costs) credits	(6)	2	1	9
Income (loss) before income taxes	(310)	175	(1,124)	395
Provision (benefit) for income taxes	7	10	(11)	(105)
Net income (loss)	$ (317)	$ 165	$ (1,113)	$ 500
Net income (loss) per share:
Basic (in dollars per share)	$ (0.40)	$ 0.21	$ (1.41)	$ 0.62
Diluted (in dollars per share)	$ (0.40)	$ 0.21	$ (1.41)	$ 0.62
Weighted average common shares outstanding:
Basic (in shares)	790	802	792	813
Diluted (in shares)	790	803	792	813