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Business (Investment in unconsolidated affiliates) (Details)
$ in Millions
9 Months Ended
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