Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
CASH FLOW FROM OPERATING ACTIVITIES
Net (loss) income	$ (140)	$ 5	$ (190)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	138	278	285
Deferred income tax benefit			(78)
Net derivative (gains) losses	118	(116)	143
Net proceeds on settled derivatives		7	75
Net gains on early extinguishment of debt	(44)	(4)	(133)
Amortization of deferred gain and issuance costs		(26)	(29)
Gains on asset divestitures	(31)	(21)	(31)
Other non-cash losses in income, net		17	43
Dry hole expenses		1
Changes in operating assets and liabilities, net		(21)	(41)
Net cash provided by operating activities		120	44
CASH FLOW FROM INVESTING ACTIVITIES
Capital investments		(132)	(26)
Changes in capital investment accruals		26	(11)
Asset divestitures		33	19
Acquisitions and other		(1)
Net cash used by investing activities		(74)	(18)
CASH FLOW FROM FINANCING ACTIVITIES
Proceeds from revolving credit facility		728	743
Repayments of revolving credit facility		(733)	(701)
Payments on first-lien first-out term loan		(66)	(61)
Debt repurchases		(24)	(13)
Debt transaction costs		(2)	(7)
Contribution from noncontrolling interest, net		49
Dividends paid to noncontrolling interest		(1)
Employee stock purchases and other			3
Net cash provided (used) by financing activities		(49)	(36)
(Decrease) increase in cash and cash equivalents		(3)	(10)
Cash and cash equivalents-beginning of period		12	12
Cash and cash equivalents-end of period	$ 2	$ 9	$ 2