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Revenues (Disaggregation) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Revenue |  |  |
Performance obligations satisfied in previous periods |  | $ 10 |
Recognized pre-operating costs | $ 9 | 2 |
Unrecognized pre-operating costs | 44 |  | $ 34
Contract drilling revenues | 759 | 754 |
Ultra-deepwater floaters |  |  |
Revenue |  |  |
Contract drilling revenues | 528 | 476 |
Harsh environment floaters |  |  |
Revenue |  |  |
Contract drilling revenues | 220 | 258 |
Deepwater floaters |  |  |
Revenue |  |  |
Contract drilling revenues |  | 6 |
Midwater floaters |  |  |
Revenue |  |  |
Contract drilling revenues | 11 | 14 |
U.S. |  |  |
Revenue |  |  |
Contract drilling revenues | 287 | 314 |
U.S. | Ultra-deepwater floaters |  |  |
Revenue |  |  |
Contract drilling revenues | 287 | 314 |
Norway |  |  |
Revenue |  |  |
Contract drilling revenues | 207 | 181 |
Norway | Harsh environment floaters |  |  |
Revenue |  |  |
Contract drilling revenues | 207 | 181 |
Brazil |  |  |
Revenue |  |  |
Contract drilling revenues | 59 | 32 |
Brazil | Ultra-deepwater floaters |  |  |
Revenue |  |  |
Contract drilling revenues | 59 | 26 |
Brazil | Deepwater floaters |  |  |
Revenue |  |  |
Contract drilling revenues |  | 6 |
Other |  |  |
Revenue |  |  |
Contract drilling revenues | 206 | 227 |
Other | Ultra-deepwater floaters |  |  |
Revenue |  |  |
Contract drilling revenues | 182 | 136 |
Other | Harsh environment floaters |  |  |
Revenue |  |  |
Contract drilling revenues | 13 | 77 |
Other | Midwater floaters |  |  |
Revenue |  |  |
Contract drilling revenues | $ 11 | $ 14 |

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