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Consolidated Condensed Statements of Operations - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
REVENUES    
Oil and natural gas net sales $ 304 $ 549
Other revenue 18 28
Total revenues 322 577
COSTS AND OTHER    
Production costs 184 242
General and administrative expenses 67 76
Depreciation, depletion and amortization 147 253
Taxes other than on income 39 55
Exploration expense 5 17
Interest and debt expense, net 74 79
Other (income) / expenses, net (66) 24
Total costs and other 450 746
LOSS BEFORE INCOME TAXES (128) (169)
Income tax benefit 78 69
NET LOSS $ (50) $ (100)
Net loss per share of common stock    
Basic (in dollars per share) $ (0.13) $ (0.26)
Diluted (in dollars per share) $ (0.13) (0.26)
Dividends per common share   $ 0.01