v3.25.2
Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Finance Lease Obligations (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jul. 29, 2024
Debt Instrument [Line Items]      
Long-term debt $ 8,451 $ 8,539  
Finance lease, liability 236 116  
Total debt and finance lease obligations 8,521 8,618  
Less: Debt issuance costs (70) (79)  
Less: Current maturities (711) (392)  
Long-term debt and finance lease obligations 7,740 8,147  
Fixed rate special facility bonds, due through 2036      
Debt Instrument [Line Items]      
Secured debt 43 43  
2019-1 Series AA, due through 2032      
Debt Instrument [Line Items]      
Secured debt 438 452  
2019-1 Series A, due through 2028      
Debt Instrument [Line Items]      
Secured debt 137 141  
2019-1 Series B, due through 2027      
Debt Instrument [Line Items]      
Secured debt 51 58  
2020-1 Series A, due through 2032      
Debt Instrument [Line Items]      
Secured debt 448 469  
2020-1 Series B, due through 2028      
Debt Instrument [Line Items]      
Secured debt 91 100  
Fixed rate equipment notes, due through 2028      
Debt Instrument [Line Items]      
Secured debt 152 219  
Floating rate equipment notes, due through 2036      
Debt Instrument [Line Items]      
Secured debt 706 742  
Aircraft failed sale-leaseback transactions, due through 2036      
Debt Instrument [Line Items]      
Secured debt 2,163 2,221  
TrueBlue® senior secured notes, due through 2031      
Debt Instrument [Line Items]      
Long-term debt 1,989 1,988  
TrueBlue® senior secured term loan facility, due through 2029      
Debt Instrument [Line Items]      
Long-term debt 747 749  
Unsecured CARES Act Payroll Support Program loan, due through 2030      
Debt Instrument [Line Items]      
Unsecured debt 259 259  
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031      
Debt Instrument [Line Items]      
Unsecured debt 144 144  
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031      
Debt Instrument [Line Items]      
Unsecured debt 132 132  
0.50% convertible senior notes, due through 2026      
Debt Instrument [Line Items]      
Long-term debt $ 325 325  
Debt instrument, interest rate, stated percentage (in percent) 0.50%    
2.50% convertible senior notes, due through 2029      
Debt Instrument [Line Items]      
Long-term debt $ 460 $ 460  
Debt instrument, interest rate, stated percentage (in percent) 2.50%   2.50%