Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
REVENUES AND OTHER
Oil and gas net sales	$ 461	$ 424	$ 1,387	$ 1,157
Net derivative (losses) gains	(65)	(14)	51	(157)
Other revenue	49	46	113	95
Total revenues and other	445	456	1,551	1,095
COSTS AND OTHER
Production costs	222	211	649	583
General and administrative expenses	63	58	191	186
Depreciation, depletion and amortization	134	137	412	422
Taxes other than on income	39	37	103	118
Exploration expense	5	3	17	13
Other expenses, net	29	29	76	76
Total costs and other	492	475	1,448	1,398
OPERATING (LOSS) INCOME	(47)	(19)	103	(303)
NON-OPERATING (LOSS) INCOME
Interest and debt expense, net	(85)	(95)	(252)	(243)
Net gains on early extinguishment of debt		660	4	793
Gains on asset divestitures			21	31
Other non-operating expense			(3)
(LOSS) INCOME BEFORE INCOME TAXES	(132)	546	(127)	278
Income tax benefit				78
NET (LOSS) INCOME	(132)	546	(127)	356
Net income attributable to noncontrolling interest	(1)		(1)
NET (LOSS) INCOME ATTRIBUTABLE TO COMMON STOCK	$ (133)	$ 546	$ (128)	$ 356
(Loss) Earnings per share attributable to common stock
Basic (in dollars per share)	$ (3.11)	$ 13.04	$ (3.01)	$ 8.79
Diluted (in dollars per share)	$ (3.11)	$ 13.04	$ (3.01)	$ 8.79