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Debt - PSP1 Promissory Note (Details) - USD ($)
$ in Billions
8 Months Ended
Apr. 30, 2020
Dec. 31, 2020
US Department Of The Treasury, CARES Act, Payroll Support Program One    
Debt Instrument [Line Items]    
Proceeds from government assistance, payroll support program, CARES Act   $ 6.0
PSP1, CAREs Act    
Debt Instrument [Line Items]    
Aggregate principal issued   $ 1.8
PSP1, CAREs Act | Interest Rate First Five Years    
Debt Instrument [Line Items]    
Fixed interest rate per annum 1.00%  
PSP1, CAREs Act | Interest Rate Years Six Through Ten | Secured Overnight Financing Rate or Other    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00%  
Floor interest rate 0.00%  
PSP1, CAREs Act | US Department Of The Treasury, CARES Act, Payroll Support Program One    
Debt Instrument [Line Items]    
Increase in debt instrument face amount for each installment disbursed (in percentage) 30.00%