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Business Combinations (Proforma) (Details) - Songa - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Pro forma information |  |  |  |
Revenue since acquisition | $ 137 |  | $ 356 |
Net income since acquisition | 16 |  | 36 |
Contract drilling revenues | 816 | $ 954 | 2,319 | $ 2,749
Net loss | $ (409) | $ (1,417) | $ (1,753) | $ (2,977)
Per share loss - basic and diluted (in dollars per share) | $ (0.88) | $ (3.11) | $ (3.79) | $ (6.55)

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