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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Operating revenues        
Contract drilling revenues $ 883 $ 1,569 $ 2,912 $ 5,346
Other revenues 20 39 275 189
Total operating revenues 903 1,608 3,187 5,535
Costs and expenses        
Operating and maintenance 404 880 1,569 2,161
Depreciation 225 210 667 750
General and administrative 39 45 124 135
Total costs and expenses 668 1,135 2,360 3,046
Loss on impairment (11) (13) (34) (1,839)
Gain (loss) on disposal of assets, net 1 (15)   (20)
Operating income 225 445 793 630
Other income (expense), net        
Interest income 5 5 15 17
Interest expense, net of amounts capitalized (112) (109) (296) (345)
Gain on retirement of debt 110 7 148 7
Other, net 7 (4) 9 38
Total other income (expense), net 10 (101) (124) (283)
Income from continuing operations before income tax expense 235 344 669 347
Income tax expense (benefits) (9) 17 82 140
Income from continuing operations 244 327 587 207
Income from discontinued operations, net of tax   3   2
Net income (loss) 244 330 587 209
Net income attributable to noncontrolling interest 15 9 32 29
Net income attributable to controlling interest $ 229 $ 321 $ 555 $ 180
Earnings per share-basic        
Earnings from continuing operations (in dollars per share) $ 0.62 $ 0.87 $ 1.50 $ 0.48
Earnings from discontinued operations (in dollars per share)   0.01   0.01
Earnings per share (in dollars per share) 0.62 0.88 1.50 0.49
Earnings per share-diluted        
Earnings from continuing operations (in dollars per share) 0.62 0.87 1.49 0.48
Earnings from discontinued operations (in dollars per share)   0.01   0.01
Earnings per share (in dollars per share) $ 0.62 $ 0.88 $ 1.49 $ 0.49
Weighted-average shares outstanding        
Basic (in shares) 365 364 365 363
Diluted (in shares) 365 364 365 363