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v3.19.3.a.u2

Business Combinations (Pro forma) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Unaudited pro forma information |  |
Contract drilling revenues | $ 3,373 | $ 4,386
Net loss | $ (2,124) | $ (3,174)
Per share loss - basic and diluted (in dollars per share) | $ (3.47) | $ (5.29)
Songa |  |
Unaudited pro forma information |  |
Revenue since acquisition | $ 497 |
Net income (loss) since acquisition | 87 |
Ocean Rig |  |
Unaudited pro forma information |  |
Revenue since acquisition | 15 |
Net income (loss) since acquisition | $ (8) |

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