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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
NET LOSS $ (921) $ (3,720)
ADJUSTMENTS TO RECONCILE NET LOSS TO CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES:    
Depreciation, depletion and amortization 300 719
Deferred income tax expense (benefit) 0 (1,372)
Derivative gains, net (201) (172)
Cash receipts on derivative settlements, net 267 408
Stock-based compensation 12 23
Impairment of oil and natural gas properties 853 4,976
Net (gains) losses on sales of fixed assets (4) 3
Impairments of fixed assets and other 33 2
Losses on investments 0 7
Loss on sale of investment 10 0
Gains on purchases or exchanges of debt (100) 0
Restructuring and other termination costs 0 (10)
Provision for legal contingencies 22 25
Other (8) (7)
Changes in assets and liabilities (684) (459)
Net Cash Provided By (Used In) Operating Activities (421) 423
CASH FLOWS FROM INVESTING ACTIVITIES:    
Drilling and completion costs (265) (1,306)
Acquisitions of proved and unproved properties (67) (128)
Proceeds from divestitures of proved and unproved properties 62 21
Additions to other property and equipment (10) (58)
Proceeds from sales of other property and equipment 9 2
Additions to investments 0 (1)
Other (2) (2)
Net Cash Used In Investing Activities (273) (1,472)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Cash paid to purchase debt (472) 0
Proceeds from credit facilities borrowings 515 0
Payments on credit facilities borrowings (148) 0
Cash paid for common stock dividends 0 (59)
Cash paid for preferred stock dividends 0 (43)
Distributions to noncontrolling interest owners (5) (29)
Other (5) (21)
Net Cash Used In Financing Activities (115) (152)
Net decrease in cash and cash equivalents (809) (1,201)
Cash and cash equivalents, beginning of period 825 4,108
Cash and cash equivalents, end of period 16 2,907
SUPPLEMENTAL CASH FLOW INFORMATION:    
Interest paid, net of capitalized interest 39 43
Income taxes paid, net of refunds received (19) 47
SUPPLEMENTAL DISCLOSURE OF SIGNIFICANT NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Change in accrued drilling and completion costs (9) 63
Change in divested proved and unproved properties 0 (53)
Debt exchanged for common stock $ 77 $ 0