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Debt - Narrative (Details)
1 Months Ended 3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
aircraft
Apr. 22, 2020
USD ($)
Revolving Credit Facility      
Debt Instrument [Line Items]      
Proceeds from revolving credit facilities   $ 3,000,000,000.0  
Undrawn credit facilities $ 21,000,000 21,000,000  
2020 Secured Term Loan Facility | Term Loan      
Debt Instrument [Line Items]      
Debt instrument amount $ 2,700,000,000 2,700,000,000  
Debt instrument term 364 days    
Maximum amount available, including accordion feature $ 4,000,000,000.0 4,000,000,000.0  
2020 Secured Term Loan Facility | Term Loan | Subsequent Event      
Debt Instrument [Line Items]      
Debt instrument amount     $ 3,000,000,000.0
Pass Through Certificates Series 2020-1 | Secured Debt      
Debt Instrument [Line Items]      
Debt instrument amount $ 1,000,000,000 $ 1,000,000,000  
Number of aircraft to secure debt | aircraft   33