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Revenues (Disaggregation) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue                      
Performance obligations satisfied in previous periods                 $ 10 $ 174  
Recognized pre-operating costs                 18 45 $ 45
Unrecognized pre-operating costs $ 34       $ 2       34 2  
Contract drilling revenues $ 792 $ 784 $ 758 $ 754 $ 748 $ 816 $ 790 $ 664 3,088 3,018 2,973
Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     2,973
Ultra-deepwater floaters                      
Revenue                      
Contract drilling revenues                 1,957 1,788  
Ultra-deepwater floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     2,048
Harsh environment floaters                      
Revenue                      
Contract drilling revenues                 1,069 974  
Harsh environment floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     456
Deepwater floaters                      
Revenue                      
Contract drilling revenues                 7 124  
Deepwater floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     144
Midwater floaters                      
Revenue                      
Contract drilling revenues                 55 74  
Midwater floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     153
High specification jackups                      
Revenue                      
Contract drilling revenues                   58  
High specification jackups | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     172
U.S.                      
Revenue                      
Contract drilling revenues                 1,264 1,496 1,527
U.S. | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     1,527
U.S. | Ultra-deepwater floaters                      
Revenue                      
Contract drilling revenues                 1,264 1,496  
U.S. | Ultra-deepwater floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     1,519
U.S. | Harsh environment floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     8
Norway                      
Revenue                      
Contract drilling revenues                 775 651 83
Norway | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     83
Norway | Harsh environment floaters                      
Revenue                      
Contract drilling revenues                 775 651  
Norway | Harsh environment floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     83
Brazil                      
Revenue                      
Contract drilling revenues                 125 110 335
Brazil | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     335
Brazil | Ultra-deepwater floaters                      
Revenue                      
Contract drilling revenues                 119 26  
Brazil | Ultra-deepwater floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     235
Brazil | Deepwater floaters                      
Revenue                      
Contract drilling revenues                 6 84  
Brazil | Deepwater floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     100
Other                      
Revenue                      
Contract drilling revenues                 924 761  
Other | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     1,028
Other | Ultra-deepwater floaters                      
Revenue                      
Contract drilling revenues                 574 266  
Other | Ultra-deepwater floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     294
Other | Harsh environment floaters                      
Revenue                      
Contract drilling revenues                 294 323  
Other | Harsh environment floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     365
Other | Deepwater floaters                      
Revenue                      
Contract drilling revenues                 1 40  
Other | Deepwater floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     44
Other | Midwater floaters                      
Revenue                      
Contract drilling revenues                 $ 55 74  
Other | Midwater floaters | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     153
Other | High specification jackups                      
Revenue                      
Contract drilling revenues                   $ 58  
Other | High specification jackups | Before adoption of Topic 606                      
Revenue                      
Contract drilling revenues                     $ 172