CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ 278	$ 636
ADJUSTMENTS TO RECONCILE NET INCOME TO CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES:
Depreciation, depletion and amortization	576	441
Derivative (gains) losses, net	368	(522)
Cash payments on derivative settlements, net	(55)	(66)
Stock-based compensation	18	27
Net (gains) losses on sales of fixed assets	7	1
Impairments	46	0
Gains on investments	(139)	0
Gains on purchases or exchanges of debt	0	(185)
Other	(102)	(43)
Changes in assets and liabilities	94	(347)
Net Cash Provided By (Used In) Operating Activities	1,091	(58)
CASH FLOWS FROM INVESTING ACTIVITIES:
Drilling and completion costs	(979)	(1,031)
Acquisitions of proved and unproved properties	(191)	(162)
Proceeds from divestitures of proved and unproved properties	384	951
Additions to other property and equipment	(5)	(7)
Proceeds from sales of other property and equipment	74	26
Proceeds from sales of investments	74	0
Net Cash Used In Investing Activities	(643)	(223)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving credit facility borrowings	6,118	2,551
Payments on revolving credit facility borrowings	(6,393)	(1,976)
Proceeds from issuance of senior notes, net	0	742
Payment for Debt Extinguishment or Debt Prepayment Cost	(122)	0
Cash paid to purchase debt	0	(1,746)
Cash paid for preferred stock dividends	(46)	(137)
Distributions to noncontrolling interest owners	(3)	(5)
Other	(4)	(17)
Net Cash Used In Financing Activities	(450)	(588)
Net decrease in cash and cash equivalents	(2)	(869)
Cash and cash equivalents, beginning of period	5	882
Cash and cash equivalents, end of period	3	13
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of capitalized interest	276	217
Income taxes paid, net of refunds received	(7)	(14)
Change in accrued drilling and completion costs [Member]
SUPPLEMENTAL DISCLOSURE OF SIGNIFICANT NON-CASH INVESTING AND FINANCING ACTIVITIES:
Change in non-cash investing and financing activities	109	87
Change in accrued acquisitions of proved and unproved properties [Member]
SUPPLEMENTAL DISCLOSURE OF SIGNIFICANT NON-CASH INVESTING AND FINANCING ACTIVITIES:
Change in non-cash investing and financing activities	1	4
Change in divested proved and unproved properties [Member]
SUPPLEMENTAL DISCLOSURE OF SIGNIFICANT NON-CASH INVESTING AND FINANCING ACTIVITIES:
Change in non-cash investing and financing activities	$ (21)	$ 16

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