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Correction of Errors in Previously Reported Consolidated Financial Statements (StmtOps) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Correction of Previously Reported Financial Statements |  |  |  |  |  |  |  |  |  |  |  |
Cumulative reduction to retained earnings |  |  |  |  |  |  |  |  |  | $ 11 |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |
Contract drilling revenues |  |  |  |  |  |  |  |  |  | 3,705 | $ 6,802 | $ 8,963
Other revenues |  |  |  |  |  |  |  |  |  | 456 | 584 | 222
Total operating revenues | $ 974 | $ 906 | $ 940 | $ 1,341 | $ 1,851 | $ 1,608 | $ 1,884 | $ 2,043 |  | 4,161 | 7,386 | 9,185
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |
Operating and maintenance |  |  |  |  |  |  |  |  |  | 1,875 | 2,955 | 5,100
Depreciation |  |  |  |  |  |  |  |  |  | 893 | 963 | 1,129
General and administrative |  |  |  |  |  |  |  |  |  | 172 | 192 | 234
Total costs and expenses |  |  |  |  |  |  |  |  |  | 2,940 | 4,110 | 6,463
Loss on impairment |  |  |  |  |  |  |  |  |  | (93) | (1,875) | (4,043)
Loss on disposal of assets, net |  |  |  |  |  |  |  |  |  | 4 | (36) | (26)
Operating income (loss) | 316 | 229 | 163 | 424 | 742 | 457 | 493 | (327) |  | 1,132 | 1,365 | (1,347)
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 20 | 22 | 20
Interest expense, net of amounts capitalized |  |  |  |  |  |  |  |  |  | (409) | (432) | (483)
Gain (loss) on retirement of debt |  | 110 | 38 |  |  |  |  |  | $ 23 | 148 | 23 | (13)
Other, net |  |  |  |  |  |  |  |  |  | 43 | 37 | 35
Total other income (expense), net |  |  |  |  |  |  |  |  |  | (198) | (350) | (441)
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  |  | 934 | 1,015 | (1,788)
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 107 | 120 | 92
Income (loss) from continuing operations | 257 | 236 | 92 | 242 | 622 | 392 | 340 | (459) |  | 827 | 895 | (1,880)
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 2 | (20)
Net income (loss) | 257 | 236 | 93 | 241 | 622 | 395 | 341 | (461) |  | 827 | 897 | (1,900)
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | 49 | 32 | (61)
Net income (loss) attributable to controlling interest | $ 243 | $ 218 | $ 82 | $ 235 | $ 616 | $ 386 | $ 335 | $ (472) |  | $ 778 | $ 865 | $ (1,839)
Earnings (loss) per share-basic |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 2.08 | $ 2.36 | $ (5.02)
Earnings (loss) from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | (0.06)
Earnings (loss) per share (in dollars per share) | $ 0.64 | $ 0.59 | $ 0.22 | $ 0.64 | $ 1.68 | $ 1.06 | $ 0.91 | $ (1.30) |  | 2.08 | 2.36 | (5.08)
Earnings (loss) per share-diluted |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  | 2.08 | 2.36 | (5.02)
Earnings (loss) from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | (0.06)
Earnings (loss) per share (in dollars per share) | $ 0.64 | $ 0.59 | $ 0.22 | $ 0.64 | $ 1.68 | $ 1.06 | $ 0.91 | $ (1.30) |  | $ 2.08 | $ 2.36 | $ (5.08)
Weighted-average shares outstanding |  |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 371 | 365 | 365 | 364 | 364 | 364 | 363 | 363 |  | 367 | 363 | 362
Diluted (in shares) | 371 | 365 | 365 | 364 | 364 | 364 | 363 | 363 |  | 367 | 363 | 362
Previously reported |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |
Contract drilling revenues |  |  |  |  |  |  |  |  |  |  | $ 6,802 | $ 8,952
Other revenues |  |  |  |  |  |  |  |  |  |  | 584 | 222
Total operating revenues |  | $ 903 | $ 943 | $ 1,341 | $ 1,851 | $ 1,608 | $ 1,884 | $ 2,043 |  |  | 7,386 | 9,174
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |
Operating and maintenance |  |  |  |  |  |  |  |  |  |  | 2,955 | 5,110
Depreciation |  |  |  |  |  |  |  |  |  |  | 963 | 1,139
General and administrative |  |  |  |  |  |  |  |  |  |  | 193 | 234
Total costs and expenses |  |  |  |  |  |  |  |  |  |  | 4,111 | 6,483
Loss on impairment |  |  |  |  |  |  |  |  |  |  | (1,867) | (4,043)
Loss on disposal of assets, net |  |  |  |  |  |  |  |  |  |  | (28) | (26)
Operating income (loss) |  | 225 | 154 | 414 | 750 | 445 | 506 | (321) |  |  | 1,380 | (1,378)
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 22 | 39
Interest expense, net of amounts capitalized |  |  |  |  |  |  |  |  |  |  | (432) | (483)
Gain (loss) on retirement of debt |  |  |  |  |  |  |  |  |  |  | 23 | (13)
Other, net |  |  |  |  |  |  |  |  |  |  | 37 | 35
Total other income (expense), net |  |  |  |  |  |  |  |  |  |  | (350) | (422)
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  |  |  | 1,030 | (1,800)
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 206 | 146
Income (loss) from continuing operations |  | 244 | 87 | 256 | 617 | 327 | 347 | (467) |  |  | 824 | (1,946)
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 2 | (20)
Net income (loss) |  | 244 | 88 | 255 | 617 | 330 | 348 | (469) |  |  | 826 | (1,966)
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  | 35 | (53)
Net income (loss) attributable to controlling interest |  | $ 229 | $ 77 | $ 249 | $ 611 | $ 321 | $ 342 | $ (483) |  |  | $ 791 | $ (1,913)
Earnings (loss) per share-basic |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 2.16 | $ (5.23)
Earnings (loss) from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | (0.06)
Earnings (loss) per share (in dollars per share) |  | $ 0.62 | $ 0.21 | $ 0.68 | $ 1.66 | $ 0.87 | $ 0.93 | $ (1.32) |  |  | 2.16 | (5.29)
Earnings (loss) per share-diluted |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  | 2.16 | (5.23)
Earnings (loss) from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | (0.06)
Earnings (loss) per share (in dollars per share) |  | $ 0.62 | $ 0.21 | $ 0.68 | $ 1.66 | $ 0.87 | $ 0.93 | $ (1.32) |  |  | $ 2.16 | $ (5.29)
Adjusted |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |
Contract drilling revenues |  |  |  |  |  |  |  |  |  |  |  | $ 11
Total operating revenues |  | $ 3 | $ (3) |  |  |  |  |  |  |  |  | 11
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |
Operating and maintenance |  |  |  |  |  |  |  |  |  |  |  | (10)
Depreciation |  |  |  |  |  |  |  |  |  |  |  | (10)
General and administrative |  |  |  |  |  |  |  |  |  |  | $ (1) |
Total costs and expenses |  |  |  |  |  |  |  |  |  |  | (1) | (20)
Loss on impairment |  |  |  |  |  |  |  |  |  |  | (8) |
Loss on disposal of assets, net |  |  |  |  |  |  |  |  |  |  | (8) |
Operating income (loss) |  | 4 | 9 | $ 10 | $ (8) | $ 12 | $ (13) | $ (6) |  |  | (15) | 31
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  | (19)
Total other income (expense), net |  |  |  |  |  |  |  |  |  |  |  | (19)
Income (loss) from continuing operations before income tax expense |  |  |  |  |  |  |  |  |  |  | (15) | 12
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | (86) | (54)
Income (loss) from continuing operations |  | (8) | 5 | (14) | 5 | 65 | (7) | 8 |  |  | 71 | 66
Net income (loss) |  | (8) | 5 | (14) | 5 | 65 | (7) | 8 |  |  | 71 | 66
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (3) | (8)
Net income (loss) attributable to controlling interest |  | $ (11) | $ 5 | $ (14) | $ 5 | $ 65 | $ (7) | $ 11 |  |  | $ 74 | $ 74
Earnings (loss) per share-basic |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.20 | $ 0.21
Earnings (loss) per share (in dollars per share) |  | $ (0.03) | $ 0.01 | $ (0.04) | $ 0.02 | $ 0.19 | $ (0.02) | $ 0.02 |  |  | 0.20 | 0.21
Earnings (loss) per share-diluted |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  | 0.20 | 0.21
Earnings (loss) per share (in dollars per share) |  | $ (0.03) | $ 0.01 | $ (0.04) | $ 0.02 | $ 0.19 | $ (0.02) | $ 0.02 |  |  | $ 0.20 | $ 0.21

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