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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating revenues        
Revenues $ 816 $ 808 $ 2,270 $ 2,344
Costs and expenses        
Operating and maintenance 447 325 1,302 1,003
Depreciation 201 197 614 648
General and administrative 35 39 134 113
Total costs and expenses 683 561 2,050 1,764
Loss on impairment (432) (1,385) (1,446) (1,498)
Loss on disposal of assets, net (6) (9)   (1,602)
Operating loss (305) (1,147) (1,226) (2,520)
Other income (expense), net        
Interest income 11 21 36 34
Interest expense, net of amounts capitalized (160) (112) (455) (368)
Loss on retirement of debt (1) (1) (3) (49)
Other, net 16 8 6 11
Total other income (expense), net (134) (84) (416) (372)
Loss before income tax expense (benefit) (439) (1,231) (1,642) (2,892)
Income tax expense (benefit) (30) 180 118 103
Net loss (409) (1,411) (1,760) (2,995)
Net income (loss) attributable to noncontrolling interest   6 (6) 21
Net loss attributable to controlling interest $ (409) $ (1,417) $ (1,754) $ (3,016)
Loss per share        
Basic (in dollars per share) $ (0.88) $ (3.62) $ (3.86) $ (7.72)
Diluted (in dollars per share) $ (0.88) $ (3.62) $ (3.86) $ (7.72)
Weighted-average shares outstanding        
Basic (in shares) 463 391 454 391
Diluted (in shares) 463 391 454 391
Contract drilling revenues        
Operating revenues        
Revenues $ 816 $ 699 $ 2,270 $ 2,142
Other revenues        
Operating revenues        
Revenues   $ 109   $ 202