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Revenues (Disaggregation) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Revenue          
Performance obligations satisfied in previous periods $ 54   $ 147    
Recognized pre-operating costs 14 $ 11 36 $ 35  
Unrecognized pre-operating costs 10   10   $ 18
Contract drilling revenues 816 808 2,270 2,344  
Before adoption of Topic 606          
Revenue          
Contract drilling revenues   808   2,344  
Ultra-deepwater floaters          
Revenue          
Contract drilling revenues 483   1,331    
Ultra-deepwater floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   523   1,609  
Harsh environment floaters          
Revenue          
Contract drilling revenues 265   721    
Harsh environment floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   118   348  
Deepwater floaters          
Revenue          
Contract drilling revenues 36   106    
Deepwater floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   35   106  
Midwater floaters          
Revenue          
Contract drilling revenues 19   57    
Midwater floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   104   136  
High specification jackups          
Revenue          
Contract drilling revenues 13   55    
High specification jackups | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   28   145  
U.S.          
Revenue          
Contract drilling revenues 396   1,162    
U.S. | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   376   1,175  
U.S. | Ultra-deepwater floaters          
Revenue          
Contract drilling revenues 396   1,162    
U.S. | Ultra-deepwater floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   368   1,167  
U.S. | Harsh environment floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   8   8  
U.K.          
Revenue          
Contract drilling revenues 47   118    
U.K. | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   70   252  
U.K. | Harsh environment floaters          
Revenue          
Contract drilling revenues 37   88    
U.K. | Harsh environment floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   62   197  
U.K. | Midwater floaters          
Revenue          
Contract drilling revenues 10   30    
U.K. | Midwater floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   8   22  
U.K. | High specification jackups | Before adoption of Topic 606          
Revenue          
Contract drilling revenues       33  
Norway          
Revenue          
Contract drilling revenues 174   467    
Norway | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   15   54  
Norway | Harsh environment floaters          
Revenue          
Contract drilling revenues 174   467    
Norway | Harsh environment floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   15   54  
Brazil          
Revenue          
Contract drilling revenues 26   75    
Brazil | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   63   271  
Brazil | Ultra-deepwater floaters          
Revenue          
Contract drilling revenues 1   1    
Brazil | Ultra-deepwater floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   39   198  
Brazil | Deepwater floaters          
Revenue          
Contract drilling revenues 25   74    
Brazil | Deepwater floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   24   73  
Other          
Revenue          
Contract drilling revenues 173   448    
Other | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   284   592  
Other | Ultra-deepwater floaters          
Revenue          
Contract drilling revenues 86   168    
Other | Ultra-deepwater floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   116   244  
Other | Harsh environment floaters          
Revenue          
Contract drilling revenues 54   166    
Other | Harsh environment floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   33   89  
Other | Deepwater floaters          
Revenue          
Contract drilling revenues 11   32    
Other | Deepwater floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   11   33  
Other | Midwater floaters          
Revenue          
Contract drilling revenues 9   27    
Other | Midwater floaters | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   96   114  
Other | High specification jackups          
Revenue          
Contract drilling revenues $ 13   $ 55    
Other | High specification jackups | Before adoption of Topic 606          
Revenue          
Contract drilling revenues   $ 28   $ 112