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Drilling Fleet (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest    
Total capital expenditures $ 140 $ 386
Construction in Progress    
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest    
Construction work in progress, at beginning of period 1,392 2,171
Total capital expenditures 140 386
Changes in accrued capital additions (6) (22)
Construction work in progress acquired in business combination 26  
Construction work in progress sold   (289)
Construction work in progress, at end of period 588 2,180
New builds    
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest    
Total capital expenditures 64 299
Property and equipment placed into service (903)  
Other property and equipment    
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest    
Total capital expenditures 76 87
Property and equipment placed into service $ (61) $ (66)