Consolidated Statements of Operations - 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:
Revenue	$ 1,857	$ 2,406	$ 5,008	$ 7,030
Interest and other income (loss), net	13	(222)	(145)	(42)
Derivative gain (loss), net	(57)	121	60	150
Gain (loss) on disposition of assets, net	2	20	7	(477)
Total revenues and other income	1,815	2,325	4,930	6,661
Costs and expenses:
Production and ad valorem taxes	63	86	182	223
Depletion, depreciation and amortization	393	438	1,243	1,271
Exploration and abandonments	16	11	35	46
General and administrative	64	72	180	246
Accretion of discount on asset retirement obligations	2	2	7	7
Interest	34	29	94	88
Other	98	32	273	390
Costs and Expenses	1,831	2,022	5,118	6,122
Income (loss) before income taxes	(16)	303	(188)	539
Income tax benefit (provision)	(4)	(72)	18	(127)
Net income (loss) attributable to common stockholders	$ (20)	$ 231	$ (170)	$ 412
Net income per share attributable to common stockholders:
Basic and diluted net income (loss) per share attributable to common stockholders	$ (0.12)	$ 1.38	$ (1.03)	$ 2.44
Weighted average shares outstanding:
Basic and diluted weighted average shares outstanding	165	167	165	168
Dividends declared per share	$ 0.55	$ 0.44	$ 1.65	$ 0.76
Oil and gas
Revenues and other income:
Revenue	$ 922	$ 1,235	$ 2,617	$ 3,567
Costs and expenses:
Costs and expenses	163	227	506	667
Sales of purchased oil and gas
Revenues and other income:
Revenue	935	1,171	2,391	3,463
Costs and expenses:
Costs and expenses	$ 998	$ 1,125	$ 2,598	$ 3,184