Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues and other income:
Revenues from contracts with customers	$ 1,438	$ 761	$ 3,869	$ 2,275
Net gain (loss) on commodity derivatives	(79)	(1)	(398)	131
Income (loss) from equity method investments	86	(10)	179	(174)
Net gain on disposal of assets	7	1	8	8
Other income	1	3	9	16
Total revenues and other income	1,453	754	3,667	2,256
Costs and expenses:
Production	131	129	378	418
Shipping, handling and other operating	219	183	538	432
Exploration	63	27	109	81
Depreciation, depletion and amortization	522	554	1,550	1,795
Impairments	13	1	60	98
Taxes other than income	88	49	236	145
General and administrative	70	53	227	217
Total costs and expenses	1,106	996	3,098	3,186
Income (loss) from operations	347	(242)	569	(930)
Net interest and other	(57)	(62)	(129)	(195)
Other net periodic benefit (costs) credits	0	(6)	2	1
Loss on early extinguishment of debt	(102)	0	(121)	0
Income (loss) before income taxes	188	(310)	321	(1,124)
Provision (benefit) for income taxes	4	7	24	(11)
Net income (loss)	$ 184	$ (317)	$ 297	$ (1,113)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.23	$ (0.40)	$ 0.38	$ (1.41)
Diluted (in dollars per share)	$ 0.23	$ (0.40)	$ 0.38	$ (1.41)
Weighted average common shares outstanding:
Basic (in shares)	789	790	791	792
Diluted (in shares)	789	790	791	792