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Debt - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 02, 2024
Feb. 22, 2024
Feb. 15, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Apr. 16, 2024
Debt Instrument [Line Items]              
Repayments of long-term debt         $ 6,217 $ 2,614  
Unamortized debt discount         249    
Secured Debt | Term Loan Facility              
Debt Instrument [Line Items]              
Proceeds from issuance of debt   $ 2,500          
Secured Debt | Term Loan Facility | Subsequent Event              
Debt Instrument [Line Items]              
Repayments of long-term debt $ 1,800            
Secured Debt | Term Loan Due 2021              
Debt Instrument [Line Items]              
Repayments of long-term debt   $ 1,370   $ 1,000   $ 1,000  
Secured Debt | Aircraft Purchase Financing              
Debt Instrument [Line Items]              
Aggregate principal amount of debt         $ 900    
Secured Debt | Secured Overnight Financing Rate (SOFR) | Term Loan Facility              
Debt Instrument [Line Items]              
Percent spread on variable rate   2.75%          
Debt instrument, interest rate floor   0.00%          
Secured Debt | Secured Overnight Financing Rate (SOFR) | Aircraft Purchase Financing              
Debt Instrument [Line Items]              
Percent spread on variable rate         2.00%    
Secured Debt | Other Market Rate Loans | Term Loan Facility              
Debt Instrument [Line Items]              
Percent spread on variable rate   1.75%          
Debt instrument, interest rate floor   1.00%          
Secured Debt | Revolving Credit Facility              
Debt Instrument [Line Items]              
Line of credit facility, increase (decrease) in maximum borrowing capacity     $ 1,115       $ 100
Undrawn and available amount under revolving credit facility         $ 2,965    
Secured Debt | Revolving Credit Facility | Extending Lenders              
Debt Instrument [Line Items]              
Maximum borrowing capacity     2,700       2,800
Secured Debt | Revolving Credit Facility | Non-Extending Lenders              
Debt Instrument [Line Items]              
Maximum borrowing capacity     $ 165       $ 165
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Secured Overnight Financing Rate (SOFR) | Minimum              
Debt Instrument [Line Items]              
Percent spread on variable rate     3.00%        
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Secured Overnight Financing Rate (SOFR) | Maximum              
Debt Instrument [Line Items]              
Percent spread on variable rate     3.50%        
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Other Market Rate Loans | Minimum              
Debt Instrument [Line Items]              
Percent spread on variable rate     2.00%        
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Other Market Rate Loans | Maximum              
Debt Instrument [Line Items]              
Percent spread on variable rate     2.50%