Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues and other income:
Revenue	$ 9,671	$ 9,379
Interest and other	76	38	$ 53
Derivative gain (loss), net	34	(292)	(100)
Gain (loss) on disposition of assets, net	(477)	290	208
Revenues	9,304	9,415	5,455
Costs and expenses:
Production and ad valorem taxes	299	284	215
Depletion, depreciation and amortization	1,711	1,534	1,400
Impairment of oil and gas properties	0	77	285
Exploration and abandonments	58	114	106
General and administrative	324	381	326
Accretion of discount on asset retirement obligations	10	14	19
Interest	121	126	153
Other	448	849	244
Costs and Expenses	8,317	8,164	5,146
Income before income taxes	987	1,251	309
Income tax (provision) benefit	(231)	(276)	524
Net income	756	975	833
Net loss attributable to noncontrolling interests	0	3	0
Net income attributable to common stockholders	$ 756	$ 978	$ 833
Net income per share attributable to common stockholders:
Basic (usd per share)	$ 4.50	$ 5.71	$ 4.86
Diluted (usd per share)	$ 4.50	$ 5.70	$ 4.85
Basic and diluted weighted average shares outstanding	167	171	170
Oil and gas
Revenues and other income:
Revenue	$ 4,916	$ 4,991	$ 3,518
Costs and expenses:
Cost of revenue	874	855	591
Sales of purchased oil and gas
Revenues and other income:
Revenue	4,755	4,388	1,776
Costs and expenses:
Cost of revenue	$ 4,472	$ 3,930	$ 1,807