Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
REVENUES
Oil and natural gas sales	$ 2,270	$ 2,590	$ 1,936
Net derivative (loss) gain from commodity contracts	(59)	1	(90)
Other revenue	423	473	160
Total revenues	2,634	3,064	2,006
COSTS
Production costs	895	912	876
General and administrative expenses	290	299	249
Depreciation, depletion and amortization	471	502	544
Taxes other than on income	157	149	136
Exploration expense	29	34	22
Other expenses, net	363	399	106
Total costs	2,205	2,295	1,933
OPERATING INCOME	429	769	73
NON-OPERATING (LOSS) INCOME
Interest and debt expense, net	(383)	(379)	(343)
Net gain on early extinguishment of debt	126	57	4
Gain on asset divestitures	0	5	21
Other non-operating expenses	(72)	(23)	(17)
INCOME (LOSS) BEFORE INCOME TAXES	100	429	(262)
Income tax provision	(1)	0	0
NET INCOME (LOSS)	99	429	(262)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS
Mezzanine equity	(117)	(99)	0
Equity	(10)	(2)	(4)
Net income attributable to noncontrolling interests	(127)	(101)	(4)
NET (LOSS) INCOME ATTRIBUTABLE TO COMMON STOCK	$ (28)	$ 328	$ (266)
Net (loss) income attributable to common stock per share
Basic (in dollars per share)	$ (0.57)	$ 6.77	$ (6.26)
Diluted (in dollars per share)	$ (0.57)	$ 6.77	$ (6.26)