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Redeemable non-controlling interest - Schedule of Changes in Redeemable Non-controlling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Increase (Decrease) in Temporary Equity [Roll Forward]      
Beginning balance   $ 38  
Ending balance $ 37    
Asia Offshore Drilling Ltd | Redeemable non-controlling interest      
Increase (Decrease) in Temporary Equity [Roll Forward]      
Beginning balance 38 38  
Net loss attributable to redeemable non-controlling interest in the period   (1)  
Fair value adjustment (1) 1  
Ending balance $ 37 $ 38  
Asia Offshore Drilling Ltd | Redeemable non-controlling interest | Predecessor      
Increase (Decrease) in Temporary Equity [Roll Forward]      
Beginning balance     $ 0
Reclassification from non-controlling interest     150
Net loss attributable to redeemable non-controlling interest in the period     2
Fair value adjustment     (127)
Ending balance     $ 25