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Debt - PSP Promissory Note (Details) - USD ($)
$ in Millions
Apr. 23, 2021
Jan. 15, 2021
Apr. 20, 2020
Dec. 31, 2021
PSP1 Promissory Note        
Debt Instrument [Line Items]        
Aggregate principal issued     $ 1,800 $ 1,800
Number of days within the occurrence of triggering event     30 days  
PSP1 Promissory Note | Interest Rate First Five Years        
Debt Instrument [Line Items]        
Fixed interest rate per annum     1.00%  
PSP1 Promissory Note | 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%  
PSP2 Promissory Note        
Debt Instrument [Line Items]        
Aggregate principal issued   $ 1,000   1,000
Number of days within the occurrence of triggering event   30 days    
PSP2 Promissory Note | Interest Rate First Five Years        
Debt Instrument [Line Items]        
Fixed interest rate per annum   1.00%    
PSP2 Promissory Note | 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%    
PSP3 Promissory Note        
Debt Instrument [Line Items]        
Aggregate principal issued       $ 946
Number of days within the occurrence of triggering event 30 days      
PSP3 Promissory Note | Interest Rate First Five Years        
Debt Instrument [Line Items]        
Fixed interest rate per annum 1.00%      
PSP3 Promissory Note | 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%