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Drilling Fleet (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures $ 387 $ 184 $ 497
Construction work in progress impaired (609) (1,464) (1,498)
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 632 1,392 2,171
Total capital expenditures 387 184 497
Changes in accrued capital additions 20 4 (23)
Construction work in progress impaired (5)    
Construction work in progress acquired in business combination   28  
Construction work in progress sold     (289)
Construction work in progress, at end of period 753 632 1,392
New builds      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 129 75 397
Property and equipment placed into service   (903) (896)
Other property and equipment      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures 258 109 100
Property and equipment placed into service $ (281) $ (73) $ (68)