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REVENUE RECOGNITION - Statements of operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
REVENUES AND OTHER        
Oil and gas sales $ 700 $ 461 $ 1,932 $ 1,387
Net derivative loss from commodity contracts (54) (65) (259) 51
Other revenue 182 49 313 113
Total revenues and other 828 445 1,986 1,551
COSTS AND OTHER        
Production costs 236 222 679 649
General and administrative expenses 81 61 234 183
Depreciation, depletion and amortization 128 134 372 412
Taxes other than on income 45 39 120 103
Exploration expenses 4 5 18 17
Other expenses, net 149 29 259 76
Total costs and other 643 490 1,682 1,440
OPERATING (LOSS) INCOME 185 (45) 304 111
NON-OPERATING (LOSS) INCOME        
Interest and debt expense, net (95) (85) (281) (252)
Net gain on early extinguishment of debt 2   26 4
Gain on asset divestitures 3   4 21
Other non-operating expenses (4) (2) (16) (11)
INCOME BEFORE INCOME TAXES 91 (132) 37 (127)
Income tax 0 0 0 0
NET INCOME 91 (132) 37 (127)
Net income attributable to noncontrolling interests (25) (1) (55) (1)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK 66 $ (133) (18) $ (128)
ASU 2014-09 | Previous U.S. GAAP        
REVENUES AND OTHER        
Oil and gas sales 695   1,915  
Net derivative loss from commodity contracts (54)   (259)  
Other revenue 177   242  
Total revenues and other 818   1,898  
COSTS AND OTHER        
Production costs 236   679  
General and administrative expenses 81   234  
Depreciation, depletion and amortization 128   372  
Taxes other than on income 45   120  
Exploration expenses 4   18  
Other expenses, net 139   171  
Total costs and other 633   1,594  
OPERATING (LOSS) INCOME 185   304  
NON-OPERATING (LOSS) INCOME        
Interest and debt expense, net (95)   (281)  
Net gain on early extinguishment of debt 2   26  
Gain on asset divestitures 3   4  
Other non-operating expenses (4)   (16)  
INCOME BEFORE INCOME TAXES 91   37  
NET INCOME 91   37  
Net income attributable to noncontrolling interests (25)   (55)  
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK 66   (18)  
ASU 2014-09 | Change        
REVENUES AND OTHER        
Oil and gas sales 5   17  
Other revenue 5   71  
Total revenues and other 10   88  
COSTS AND OTHER        
Other expenses, net 10   88  
Total costs and other $ 10   $ 88