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Financial Derivative Instruments - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
aircraft
Derivative [Line Items]      
Current unrealized net loss in OCI $ 234    
Discontinuation of interest rate cash flow hedge balance in AOCI $ 57    
Term of lease contract (in years) 9 years    
Gross amounts offset in the balance sheet $ 4 $ 6  
Designated as Hedging Instrument      
Derivative [Line Items]      
Gross amounts offset in the balance sheet 4 6  
Fuel derivative contracts      
Derivative [Line Items]      
Collateral deposits 175 34  
Fuel derivative contracts | Other assets      
Derivative [Line Items]      
Gross amounts offset in the balance sheet 95 31  
Fuel derivative contracts | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Loss from AOCI into other (gains) losses 6 39  
Interest rate derivatives | Other noncurrent liabilities      
Derivative [Line Items]      
Collateral deposits 0    
Gross amounts offset in the balance sheet 4 6  
Interest rate derivatives | Designated as Hedging Instrument | Other noncurrent liabilities      
Derivative [Line Items]      
Gross amounts offset in the balance sheet $ 4 $ 6  
Interest Rate Swaption [Member]      
Derivative [Line Items]      
Number of aircraft leases | aircraft     12