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Redeemable non-controlling interest (Details) - Asia Offshore Drilling - USD ($)
$ in Millions
6 Months Ended
Sep. 11, 2020
Jun. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Increase (Decrease) in Temporary Equity [Roll Forward]        
Ownership interest in AOD 100.00%      
Fair value of non-controlling interest $ 31      
Mermaid        
Increase (Decrease) in Temporary Equity [Roll Forward]        
Noncontrolling interest, ownership percentage by noncontrolling owners 33.76%      
Redeemable non-controlling interest        
Increase (Decrease) in Temporary Equity [Roll Forward]        
Beginning balance   $ 57    
Fair value adjustment   (30)    
Reclassifications of Temporary to Permanent Equity   (1)    
Ending balance   26    
Redeemable non-controlling interest   $ 26 $ 0 $ 0