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Revenues (Disaggregation) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Revenue      
Performance obligations satisfied in previous periods   $ 10  
Recognized pre-operating costs $ 9 2  
Unrecognized pre-operating costs 44   $ 34
Contract drilling revenues 759 754  
Ultra-deepwater floaters      
Revenue      
Contract drilling revenues 528 476  
Harsh environment floaters      
Revenue      
Contract drilling revenues 220 258  
Deepwater floaters      
Revenue      
Contract drilling revenues   6  
Midwater floaters      
Revenue      
Contract drilling revenues 11 14  
U.S.      
Revenue      
Contract drilling revenues 287 314  
U.S. | Ultra-deepwater floaters      
Revenue      
Contract drilling revenues 287 314  
Norway      
Revenue      
Contract drilling revenues 207 181  
Norway | Harsh environment floaters      
Revenue      
Contract drilling revenues 207 181  
Brazil      
Revenue      
Contract drilling revenues 59 32  
Brazil | Ultra-deepwater floaters      
Revenue      
Contract drilling revenues 59 26  
Brazil | Deepwater floaters      
Revenue      
Contract drilling revenues   6  
Other      
Revenue      
Contract drilling revenues 206 227  
Other | Ultra-deepwater floaters      
Revenue      
Contract drilling revenues 182 136  
Other | Harsh environment floaters      
Revenue      
Contract drilling revenues 13 77  
Other | Midwater floaters      
Revenue      
Contract drilling revenues $ 11 $ 14