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Debt Financing - Narrative (Details)
1 Months Ended 4 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
aircraft
Apr. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
aircraft
Nov. 04, 2021
USD ($)
Sep. 10, 2021
USD ($)
Dec. 31, 2020
USD ($)
aircraft
Debt Instrument [Line Items]            
Debt financing balance $ 17,811,372,000   $ 17,811,372,000     $ 16,696,081,000
Senior notes            
Debt Instrument [Line Items]            
Debt financing balance 17,490,582,000   17,490,582,000     15,583,544,000
Medium Term Note Program | Senior notes            
Debt Instrument [Line Items]            
Principal amount issued 3,700,000,000   3,700,000,000      
Medium Term Note Program, $750 Million, Due 2024 | Senior notes            
Debt Instrument [Line Items]            
Principal amount issued $ 750,000,000   $ 750,000,000      
Interest rate 0.70%   0.70%      
Medium Term Note Program, $1.2 Billion Due 2026 | Senior notes            
Debt Instrument [Line Items]            
Principal amount issued $ 1,200,000,000   $ 1,200,000,000      
Interest rate 1.875%   1.875%      
Medium Term Note Program, $600 Million, Due 2022 | Senior notes            
Debt Instrument [Line Items]            
Principal amount issued $ 600,000,000   $ 600,000,000      
Medium Term Note Program, $600 Million, Due 2022 | LIBOR | Senior notes            
Debt Instrument [Line Items]            
Interest margin     0.35%      
Medium Term Note Program, $600 Million, Due 2024 | Senior notes            
Debt Instrument [Line Items]            
Principal amount issued $ 600,000,000   $ 600,000,000      
Interest rate 0.80%   0.80%      
Medium Term Note Program, $500 Million, Due 2028 | Senior notes            
Debt Instrument [Line Items]            
Principal amount issued $ 500,000,000   $ 500,000,000      
Interest rate 2.10%   2.10%      
Revolving credit facility            
Debt Instrument [Line Items]            
Debt financing balance $ 0   $ 0     0
Facility fee     0.20%      
Maximum borrowing capacity 6,500,000,000 $ 6,400,000,000 $ 6,500,000,000      
Increase in maximum capacity from prior period   6.70%        
Additional borrowing capacity         $ 50,000,000  
Revolving credit facility | LIBOR            
Debt Instrument [Line Items]            
Interest margin     1.05%      
Revolving credit facility | Base Rate            
Debt Instrument [Line Items]            
Interest margin     0.05%      
Unsecured Revolving Credit Facility Mature May 5, 2025 | Debt Instrument, Redemption, May 5, 2025 | Subsequent Event            
Debt Instrument [Line Items]            
Line of credit maturity amount       $ 5,800,000,000    
Unsecured Revolving Credit Facility Mature May 5, 2023 | Debt Instrument, Redemption, May 5, 2023 | Subsequent Event            
Debt Instrument [Line Items]            
Line of credit maturity amount       575,000,000    
Unsecured Revolving Credit Facility Mature May 5, 2022 | Debt Instrument, Redemption, May 5, 2022 | Subsequent Event            
Debt Instrument [Line Items]            
Line of credit maturity amount       $ 105,000,000    
Secured Debt            
Debt Instrument [Line Items]            
Debt financing balance $ 149,815,000   $ 149,815,000     $ 300,987,000
Number of aircraft pledged as collateral | aircraft 3   3     12
Net book value of aircraft pledged as collateral $ 224,700,000   $ 224,700,000     $ 628,700,000
Uncommitted Unsecured Revolving Credit Facility | Revolving credit facility | Unsecured Debt            
Debt Instrument [Line Items]            
Maximum borrowing capacity 75,000,000   75,000,000      
Facility outstanding amount $ 0   $ 0      
Uncommitted Unsecured Revolving Credit Facility | LIBOR | Revolving credit facility | Unsecured Debt            
Debt Instrument [Line Items]            
Interest margin 0.90%