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Business (Investment in unconsolidated affiliates) (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Investments |
Investment in unconsolidated affiliate | $ 107
Cost method investment | 16
Transocean Norge |
Investments |
Equity method investment | $ 91
Ownership percentage | 33.00%
Total purchase price for investment | $500
Transocean Norge | January 2019 payment |
Investments |
Equity method investment | $ 50
Transocean Norge | January 2020 payment |
Investments |
Equity method investment | $ 33

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