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Debt - Narrative (Details)
12 Months Ended
Feb. 22, 2024
USD ($)
Feb. 15, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 20, 2023
USD ($)
aircraft
Apr. 21, 2021
USD ($)
Debt Instrument [Line Items]              
Debt prepayment     $ 4,248,000,000 $ 4,011,000,000 $ 5,205,000,000    
Secured Debt              
Debt Instrument [Line Items]              
Borrowing amount     400,000,000        
Secured Debt | Revolving Credit Facility              
Debt Instrument [Line Items]              
Available under revolving credit facility     $ 1,750,000,000        
Secured Debt | Revolving Credit Facility | Subsequent Event              
Debt Instrument [Line Items]              
Change in borrowing capacity   $ 1,115,000,000          
Secured Debt | Revolving Credit Facility | Subsequent Event | Extending Lenders              
Debt Instrument [Line Items]              
Revolving loan commitment   2,700,000,000          
Secured Debt | Revolving Credit Facility | Subsequent Event | Non-Extending Lenders              
Debt Instrument [Line Items]              
Revolving loan commitment   $ 165,000,000          
Secured Debt | Minimum              
Debt Instrument [Line Items]              
Stated interest rate     7.31%        
Secured Debt | Minimum | Revolving Credit Facility | Subsequent Event | Non-Extending Lenders | Secured Overnight Financing Rate (SOFR)              
Debt Instrument [Line Items]              
Basis spread on variable rate   3.00%          
Secured Debt | Minimum | Revolving Credit Facility | Subsequent Event | Non-Extending Lenders | Other Market Rates              
Debt Instrument [Line Items]              
Basis spread on variable rate   2.00%          
Secured Debt | Maximum              
Debt Instrument [Line Items]              
Stated interest rate     7.35%        
Secured Debt | Maximum | Revolving Credit Facility | Subsequent Event | Non-Extending Lenders | Secured Overnight Financing Rate (SOFR)              
Debt Instrument [Line Items]              
Basis spread on variable rate   3.50%          
Secured Debt | Maximum | Revolving Credit Facility | Subsequent Event | Non-Extending Lenders | Other Market Rates              
Debt Instrument [Line Items]              
Basis spread on variable rate   2.50%          
Secured Debt | Borrowings Financing Aircraft Purchases              
Debt Instrument [Line Items]              
Aggregate principal amount           $ 1,300,000,000  
Number of aircrafts financed | aircraft           39  
Stated interest rate           5.80%  
Secured Debt | Term Loan Facility              
Debt Instrument [Line Items]              
Prepayment of term loan facility     $ 1,000,000,000        
Secured Debt | Term Loan Facility | Subsequent Event              
Debt Instrument [Line Items]              
Borrowing amount $ 2,500,000,000            
Secured Debt | Term Loan Facility | Subsequent Event | Secured Overnight Financing Rate (SOFR)              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.75%            
Interest rate floor 0.00%            
Secured Debt | Term Loan Facility | Subsequent Event | Other Market Rates              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.75%            
Interest rate floor 1.00%            
Secured Debt | 2021 Term Loans              
Debt Instrument [Line Items]              
Aggregate principal amount             $ 5,000,000,000
Stated interest rate     9.22%        
Secured Debt | 2021 Term Loans | Subsequent Event              
Debt Instrument [Line Items]              
Debt prepayment $ 1,370,000,000