CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ 636	$ (2,844)
ADJUSTMENTS TO RECONCILE NET INCOME (LOSS) TO CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Depreciation, depletion and amortization	441	598
Derivative (gains) losses, net	(522)	278
Cash receipts (payments) on derivative settlements, net	(66)	386
Stock-based compensation	27	25
Impairment of oil and natural gas properties	0	2,067
Net (gains) losses on sales of fixed assets	1	(5)
Impairments of fixed assets and other	1	34
Losses on investments	0	2
Loss on sale of investment	0	10
Gains on purchases or exchanges of debt	(185)	(168)
Restructuring and other termination costs	0	3
Provision for legal contingencies	15	104
Other	(59)	(51)
Changes in assets and liabilities	(347)	(765)
Net Cash Used In Operating Activities	(58)	(326)
CASH FLOWS FROM INVESTING ACTIVITIES:
Drilling and completion costs	(1,031)	(609)
Acquisitions of proved and unproved properties	(162)	(426)
Proceeds from divestitures of proved and unproved properties	951	964
Additions to other property and equipment	(7)	(25)
Proceeds from sales of other property and equipment	26	70
Cash paid for title defects	0	(69)
Other	0	(4)
Net Cash Used In Investing Activities	(223)	(99)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving credit facility borrowings	2,551	2,477
Payments on revolving credit facility borrowings	(1,976)	(2,377)
Proceeds from issuance of senior notes, net	742	0
Cash paid to purchase debt	(1,746)	(472)
Cash paid for preferred stock dividends	(137)	0
Distributions to noncontrolling interest owners	(5)	(6)
Other	(17)	(18)
Net Cash Used In Financing Activities	(588)	(396)
Net decrease in cash and cash equivalents	(869)	(821)
Cash and cash equivalents, beginning of period	882	825
Cash and cash equivalents, end of period	13	4
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of capitalized interest	217	154
Income tax refunds received, net	(14)	(20)
SUPPLEMENTAL DISCLOSURE OF SIGNIFICANT NON-CASH INVESTING AND FINANCING ACTIVITIES:
Change in accrued drilling and completion costs	87	(13)
Change in accrued acquisitions of proved and unproved properties	4	0
Change in divested proved and unproved properties	16	2
Debt exchanged for common stock	$ 0	$ 471