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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating revenues    
Revenues $ 759 $ 754
Revenue from Contract with Customer, Product and Service [Extensible List] us-gaap:OilAndGasServiceMember us-gaap:OilAndGasServiceMember
Costs and expenses    
Operating and maintenance $ 540 $ 508
Cost, Product and Service [Extensible List] us-gaap:OilAndGasServiceMember us-gaap:OilAndGasServiceMember
Depreciation and amortization $ 206 $ 217
General and administrative 43 49
Total costs and expenses 789 774
Loss on impairment (168)  
Gain (loss) on disposal of assets, net (1) 7
Operating loss (199) (13)
Other income (expense), net    
Interest income 9 10
Interest expense, net of amounts capitalized (160) (166)
Loss on retirement of debt (57) (18)
Other, net 12 8
Total other income (expense), net (196) (166)
Loss before income tax benefit (395) (179)
Income tax benefit (4) (8)
Net loss (391) (171)
Net income attributable to noncontrolling interest 1  
Net loss attributable to controlling interest $ (392) $ (171)
Loss per share    
Basic (in dollars per share) $ (0.64) $ (0.28)
Diluted (in dollars per share) $ (0.64) $ (0.28)
Weighted-average shares outstanding    
Basic (in shares) 614 611
Diluted (in shares) 614 611