Consolidated Condensed Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOW FROM OPERATING ACTIVITIES
Net income (loss)	$ 52	$ (50)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	140	147
Deferred income tax benefit		(78)
Net derivative (gains) losses	(73)	25
Net (payments) proceeds on settled derivatives	(1)	56
Net gains on early extinguishment of debt	(4)	(89)
Deferred gain and issuance costs amortization	(12)	(15)
Gains on asset divestitures	(21)
Other non-cash losses in income, net	9	21
Dry hole expenses	1
Changes in operating assets and liabilities, net	42	98
Net cash provided by operating activities	133	115
CASH FLOW FROM INVESTING ACTIVITIES
Capital investments	(50)	(21)
Changes in capital investment accruals	17	(7)
Asset divestitures	33
Acquisitions and other		(1)
Net cash used by investing activities		(29)
CASH FLOW FROM FINANCING ACTIVITIES
Proceeds from revolving credit facility	221	361
Repayments of revolving credit facility	(299)	(405)
Payments on first-lien first-out term loan	(41)	(25)
Debt repurchases	(24)	(13)
Debt transaction costs	(2)	(7)
Contribution from noncontrolling interest, net	49
Issuance of common stock	1	1
Net cash used by financing activities	(95)	(88)
Increase (decrease) in cash and cash equivalents	38	(2)
Cash and cash equivalents-beginning of period	12	12
Cash and cash equivalents-end of period	$ 50	$ 10