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Debt Financing - Narrative (Details)
$ in Thousands, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2023
USD ($)
aircraft
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
aircraft
lender_supplement
Dec. 31, 2023
USD ($)
aircraft
Feb. 15, 2024
USD ($)
Jan. 31, 2024
USD ($)
Dec. 31, 2023
CAD ($)
aircraft
May 05, 2023
USD ($)
Dec. 31, 2022
USD ($)
aircraft
Debt Instrument [Line Items]                  
Outstanding balance     $ 19,363,460 $ 19,363,460         $ 18,823,429
Secured Debt Financings                  
Debt Instrument [Line Items]                  
Outstanding balance     $ 305,500 $ 305,500         $ 125,400
Number of aircraft pledged as collateral | aircraft     4 4     4   3
Collateral with net book value     $ 445,900 $ 445,900         $ 212,100
Senior unsecured securities                  
Debt Instrument [Line Items]                  
Outstanding balance     16,329,605 16,329,605         17,095,116
Senior Notes                  
Debt Instrument [Line Items]                  
Outstanding balance     $ 15,700,000 $ 15,700,000         $ 17,100,000
Senior Notes | Minimum                  
Debt Instrument [Line Items]                  
Remaining term     1 month 1 month     1 month    
Interest rate     0.70% 0.70%     0.70%   0.70%
Senior Notes | Maximum                  
Debt Instrument [Line Items]                  
Remaining term     8 years 14 days 8 years 14 days     8 years 14 days    
Interest rate     5.94% 5.94%     5.94%   5.85%
Medium Term Notes Due 2028 - 5.30% | Senior Notes                  
Debt Instrument [Line Items]                  
Interest rate     5.30% 5.30%     5.30%    
Principal amount issued     $ 700,000 $ 700,000          
Medium Term Note Due 2028 - 5.400%                  
Debt Instrument [Line Items]                  
Interest rate     5.40% 5.40%     5.40%    
Principal amount issued             $ 500.0    
Interest rate, effective percentage     5.942% 5.942%     5.942%    
Medium Term Notes Due 2029 - 5.10% | Senior Notes | Subsequent Event                  
Debt Instrument [Line Items]                  
Interest rate           5.10%      
Principal amount issued           $ 500,000      
Trust Certificates Due 2028                  
Debt Instrument [Line Items]                  
Interest rate     5.85% 5.85%     5.85%    
Principal amount issued     $ 600,000 $ 600,000          
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Outstanding balance     $ 1,100,000 1,100,000         $ 1,020,000
Maximum borrowing capacity               $ 7,200,000  
Number of lender supplements | lender_supplement     2            
Increase in borrowing capacity     $ 275,000 $ 275,000          
Facility fee (as a percent)       0.20%          
Revolving Credit Facility | Subsequent Event                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity         $ 7,400,000        
Revolving Credit Facility | Debt Instrument, Redemption, May 5, 2027 | Subsequent Event                  
Debt Instrument [Line Items]                  
Line of credit maturity amount         7,100,000        
Revolving Credit Facility | Debt Instrument, Redemption, May 5, 2026 | Subsequent Event                  
Debt Instrument [Line Items]                  
Line of credit maturity amount         320,000        
Revolving Credit Facility | Debt Instrument, Redemption, May 5, 2025 | Subsequent Event                  
Debt Instrument [Line Items]                  
Line of credit maturity amount         $ 32,500        
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument [Line Items]                  
Interest margin       1.05%          
2023 Term Loan | Term financings                  
Debt Instrument [Line Items]                  
Principal amount issued     750,000 $ 750,000          
Credit spread adjustment       0.10%          
2023 Term Loan | Secured Overnight Financing Rate (SOFR) | Term financings                  
Debt Instrument [Line Items]                  
Interest margin       1.40%          
Unsecured Note Due 2024 | Total unsecured debt financing                  
Debt Instrument [Line Items]                  
Principal amount issued     250,000 $ 250,000          
Credit spread adjustment       0.10%          
Debt term       1 year          
Unsecured Note Due 2024 | Secured Overnight Financing Rate (SOFR) | Total unsecured debt financing                  
Debt Instrument [Line Items]                  
Interest margin       1.25%          
Term financings                  
Debt Instrument [Line Items]                  
Outstanding balance     $ 1,628,400 $ 1,628,400         $ 582,950
Secured Notes Due 2034 and 2035 | Secured Debt Financings                  
Debt Instrument [Line Items]                  
Number of aircraft pledged as collateral | aircraft 2                
Secured Notes Due 2034 | Secured Debt Financings                  
Debt Instrument [Line Items]                  
Principal amount issued   $ 112,200              
Secured Notes Due 2034 | Three Month Secured Overnight Financing Rate (SOFR) | Secured Debt Financings                  
Debt Instrument [Line Items]                  
Interest margin   0.42%              
Secured Notes Due 2035 | Secured Debt Financings                  
Debt Instrument [Line Items]                  
Principal amount issued $ 101,700                
Secured Notes Due 2035 | Three Month Secured Overnight Financing Rate (SOFR) | Secured Debt Financings                  
Debt Instrument [Line Items]                  
Interest margin 0.42%