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Related party transactions - Gains in Other Operating Income (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2019
Dec. 31, 2017
Mar. 13, 2020
Apr. 26, 2017
Related Party Transaction [Line Items]            
Carrying value of related party receivable $ 716   $ 704      
Net (loss)/gain on debt extinguishment 0 $ 0 (22) $ 19    
Disposal Group, Disposed of by Sale, Not Discontinued Operations            
Related Party Transaction [Line Items]            
Total contingent consideration recognized 0 7 0 27    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | West Polaris earn out realized            
Related Party Transaction [Line Items]            
Total contingent consideration recognized 0 0 0 13    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | West Vela earn out realized            
Related Party Transaction [Line Items]            
Total contingent consideration recognized 0 $ 7 $ 0 $ 14    
Subordinated loans including accrued interest and fees | Archer            
Related Party Transaction [Line Items]            
Related party receivable before conversion           $ 146
Related party receivable after conversion           45
Interest rate on related party receivable     5.50%      
Carrying value of related party receivable $ 43   $ 35      
Conversion price (in dollars per share)     $ 2.083      
Subordinated loans including accrued interest and fees | Archer | Subsequent Event            
Related Party Transaction [Line Items]            
Carrying value of related party receivable         $ 13  
Conversion price (in dollars per share)         $ 0.40  
Fair value | Subordinated loans including accrued interest and fees | Archer            
Related Party Transaction [Line Items]            
Carrying value of related party receivable     $ 35     56
Fair value | Embedded derivative option | Archer            
Related Party Transaction [Line Items]            
Carrying value of related party receivable     $ 0      
Carrying value | Subordinated loans including accrued interest and fees | Archer            
Related Party Transaction [Line Items]            
Carrying value of related party receivable           $ 37