CONDENSED ONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ 141	$ (1,068)
ADJUSTMENTS TO RECONCILE NET INCOME (LOSS) TO CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Depreciation, depletion and amortization	218	292
Derivative gains, net	(322)	(201)
Cash receipts (payments) on derivative settlements, net	(34)	267
Stock-based compensation	11	12
Impairment of oil and natural gas properties	0	997
Net gains on sales of fixed assets	0	(4)
Impairments of fixed assets and other	(3)	33
Loss on sale of investment	0	10
(Gains) losses on purchases or exchanges of debt	6	(100)
Provision for legal contingencies	(2)	33
Other	(29)	(8)
Changes in assets and liabilities	113	(684)
Net Cash Provided By (Used In) Operating Activities	99	(421)
CASH FLOWS FROM INVESTING ACTIVITIES:
Drilling and completion costs	(433)	(265)
Acquisitions of proved and unproved properties	(95)	(67)
Proceeds from divestitures of proved and unproved properties	892	62
Additions to other property and equipment	(3)	(10)
Proceeds from sales of other property and equipment	19	9
Other	0	(2)
Net Cash Provided By (Used In) Investing Activities	380	(273)
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash paid to purchase debt	(982)	(472)
Proceeds from revolving credit facility borrowings	50	515
Payments on revolving credit facility borrowings	(50)	(148)
Cash paid for preferred stock dividends	(114)	0
Distributions to noncontrolling interest owners	(2)	(5)
Other	(14)	(5)
Net Cash Used In Financing Activities	(1,112)	(115)
Net decrease in cash and cash equivalents	(633)	(809)
Cash and cash equivalents, beginning of period	882	825
Cash and cash equivalents, end of period	249	16
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of capitalized interest	92	39
Income taxes paid, net of refunds received	1	(19)
SUPPLEMENTAL DISCLOSURE OF SIGNIFICANT NON-CASH INVESTING AND FINANCING ACTIVITIES:
Change in accrued drilling and completion costs	68	(9)
Change in accrued acquisitions of proved and unproved properties	8	0
Change in divested proved and unproved properties	(8)	0
Debt exchanged for common stock	$ 0	$ 77