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Consolidated Condensed Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CASH FLOW FROM OPERATING ACTIVITIES    
Net loss $ (50) $ (100)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion and amortization 147 253
Deferred income tax expense / (benefit) (78) (69)
Other noncash (gains) / losses in income, net (2) 26
Dry hole expenses   6
Changes in operating assets and liabilities, net 98 (1)
Net cash provided by operating activities 115 115
CASH FLOW FROM INVESTING ACTIVITIES    
Capital investments (21) (133)
Changes in capital investment accruals (7) (173)
Acquisitions and other (1) (7)
Net cash used by investing activities (29) (313)
CASH FLOW FROM FINANCING ACTIVITIES    
Proceeds from revolving credit facility 361 757
Repayments of revolving credit facility (405) (547)
Payments on long-term debt (25)  
Debt repurchase and amendment costs (20)  
Issuance of common stock 1 2
Net cash (used) / provided by financing activities (88) 212
(Decrease) / increase in cash and cash equivalents (2) 14
Cash and cash equivalents-beginning of period 12 14
Cash and cash equivalents-end of period $ 10 $ 28