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Financial instruments and risk management - Interest Rate Risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Apr. 10, 2019
Debt Instrument [Line Items]      
Principal outstanding $ 4,939    
Hedging instruments 0    
Net exposure 4,939    
Impact of 1% increase in rates 50    
Total debt principal 6,177 $ 6,759  
Total floating rate debt obligations      
Debt Instrument [Line Items]      
Principal outstanding 5,662    
Hedging instruments 0    
Net exposure 5,662    
Impact of 1% increase in rates 57    
Total floating rate debt obligations | Senior Credit Facilities      
Debt Instrument [Line Items]      
Principal outstanding 5,662    
Hedging instruments (4,500)    
Net exposure 1,162    
Impact of 1% increase in rates 12    
Total floating rate debt obligations | Ineffective portion of interest rate cap      
Debt Instrument [Line Items]      
Principal outstanding 0    
Hedging instruments 4,500    
Net exposure 4,500    
Impact of 1% increase in rates $ 45    
Impact that would be mitigated (as a percent) 0.00%    
Hypothetical increase in rates (as a percent) 1.00%    
Less: Cash and Restricted Cash      
Debt Instrument [Line Items]      
Principal outstanding $ (723)    
Hedging instruments 0    
Net exposure (723)    
Impact of 1% increase in rates (7)    
Secured Debt | Senior secured notes      
Debt Instrument [Line Items]      
Total debt principal $ 515 $ 476 $ 476