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Interest expense - Additional Information (Details) - USD ($)
4 Months Ended 6 Months Ended 12 Months Ended
Jul. 02, 2018
Dec. 31, 2020
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Jul. 15, 2019
Apr. 10, 2019
Debt Instrument [Line Items]                
Total debt principal   $ 6,177,000,000     $ 6,177,000,000 $ 6,759,000,000    
Write off of unamortized debt discount   87,000,000 $ 0 $ 0 87,000,000 0    
Senior secured notes | Secured Debt                
Debt Instrument [Line Items]                
Debt, face amount $ 880,000,000              
Stated interest rate, cash portion (as a percent) 4.00%     4.00%        
Stated interest rate, paid-in-kind portion (as a percent) 8.00%     8.00%        
Total debt principal   515,000,000     515,000,000 476,000,000   $ 476,000,000
Face amount representing accrued interest compounded   39,000,000     39,000,000   $ 18,000,000  
Senior credit facilities | Secured Debt                
Debt Instrument [Line Items]                
Total debt principal   $ 5,662,000,000     $ 5,662,000,000 $ 5,662,000,000    
Senior credit facilities | Secured Debt | LIBOR                
Debt Instrument [Line Items]                
Increase in basis spread on variable interest rate 1.00%