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Revenues (Disaggregation) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Revenue |  |  |  |  |
Performance obligations satisfied in previous periods | $ 54 |  | $ 147 |  |
Recognized pre-operating costs | 14 | $ 11 | 36 | $ 35 |
Unrecognized pre-operating costs | 10 |  | 10 |  | $ 18
Contract drilling revenues | 816 | 808 | 2,270 | 2,344 |
Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 808 |  | 2,344 |
Ultra-deepwater floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 483 |  | 1,331 |  |
Ultra-deepwater floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 523 |  | 1,609 |
Harsh environment floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 265 |  | 721 |  |
Harsh environment floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 118 |  | 348 |
Deepwater floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 36 |  | 106 |  |
Deepwater floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 35 |  | 106 |
Midwater floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 19 |  | 57 |  |
Midwater floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 104 |  | 136 |
High specification jackups |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 13 |  | 55 |  |
High specification jackups | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 28 |  | 145 |
U.S. |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 396 |  | 1,162 |  |
U.S. | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 376 |  | 1,175 |
U.S. | Ultra-deepwater floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 396 |  | 1,162 |  |
U.S. | Ultra-deepwater floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 368 |  | 1,167 |
U.S. | Harsh environment floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 8 |  | 8 |
U.K. |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 47 |  | 118 |  |
U.K. | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 70 |  | 252 |
U.K. | Harsh environment floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 37 |  | 88 |  |
U.K. | Harsh environment floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 62 |  | 197 |
U.K. | Midwater floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 10 |  | 30 |  |
U.K. | Midwater floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 8 |  | 22 |
U.K. | High specification jackups | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  |  |  | 33 |
Norway |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 174 |  | 467 |  |
Norway | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 15 |  | 54 |
Norway | Harsh environment floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 174 |  | 467 |  |
Norway | Harsh environment floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 15 |  | 54 |
Brazil |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 26 |  | 75 |  |
Brazil | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 63 |  | 271 |
Brazil | Ultra-deepwater floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 1 |  | 1 |  |
Brazil | Ultra-deepwater floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 39 |  | 198 |
Brazil | Deepwater floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 25 |  | 74 |  |
Brazil | Deepwater floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 24 |  | 73 |
Other |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 173 |  | 448 |  |
Other | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 284 |  | 592 |
Other | Ultra-deepwater floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 86 |  | 168 |  |
Other | Ultra-deepwater floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 116 |  | 244 |
Other | Harsh environment floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 54 |  | 166 |  |
Other | Harsh environment floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 33 |  | 89 |
Other | Deepwater floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 11 |  | 32 |  |
Other | Deepwater floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 11 |  | 33 |
Other | Midwater floaters |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | 9 |  | 27 |  |
Other | Midwater floaters | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | 96 |  | 114 |
Other | High specification jackups |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues | $ 13 |  | $ 55 |  |
Other | High specification jackups | Before adoption of Topic 606 |  |  |  |  |
Revenue |  |  |  |  |
Contract drilling revenues |  | $ 28 |  | $ 112 |

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