Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues and other income:
Revenue	$ 1,141	$ 2,379	$ 3,151	$ 4,624
Interest and other income (loss), net	48	(11)	(158)	181
Derivative gain (loss), net	(336)	43	117	29
Gain (loss) on disposition of assets, net	6	(488)	6	(498)
Total revenues and other income	859	1,923	3,116	4,336
Costs and expenses:
Production and ad valorem taxes	47	69	120	136
Depletion, depreciation and amortization	416	412	850	833
Exploration and abandonments	10	15	19	35
General and administrative	60	80	116	174
Accretion of discount on asset retirement obligations	2	2	5	5
Interest	33	29	60	59
Other	90	211	175	358
Costs and Expenses	1,397	2,139	3,288	4,099
Income (loss) before income taxes	(538)	(216)	(172)	237
Income tax benefit (provision)	99	47	22	(56)
Net income (loss) attributable to common stockholders	$ (439)	$ (169)	$ (150)	$ 181
Net income per share attributable to common stockholders:
Basic and diluted net income (loss) per share attributable to common stockholders	$ (2.66)	$ (1.01)	$ (0.91)	$ 1.07
Weighted average shares outstanding:
Basic weighted average shares outstanding	165	168	165	168
Diluted weighted average shares outstanding	165	168	165	169
Dividends declared per share	$ 0.55	$ 0	$ 1.10	$ 0.32
Oil and gas
Revenues and other income:
Revenue	$ 600	$ 1,196	$ 1,695	$ 2,332
Costs and expenses:
Costs and expenses	167	219	343	440
Sales of purchased oil and gas
Revenues and other income:
Revenue	541	1,183	1,456	2,292
Costs and expenses:
Costs and expenses	$ 572	$ 1,102	$ 1,600	$ 2,059