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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Schedule of Carrying Amounts and Estimated Fair Value of Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Long-term debt $ 8,164 $ 4,716
Long term debt, fair value 8,744 4,691
Finance lease, liability 67 0
Fixed rate special facility bonds, due through 2036    
Debt Instrument [Line Items]    
Long-term debt 42 42
Long term debt, fair value 43 43
2019-1 Series AA, due through 2032    
Debt Instrument [Line Items]    
Long-term debt 463 476
Long term debt, fair value 464 474
2019-1 Series A, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 144 149
Long term debt, fair value 146 150
2019-1 Series B, due through 2027    
Debt Instrument [Line Items]    
Long-term debt 63 70
Long term debt, fair value 76 86
2020-1 Series A, due through 2032    
Debt Instrument [Line Items]    
Long-term debt 486 506
Long term debt, fair value 575 597
2020-1 Series B, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 108 117
Long term debt, fair value 136 150
Fixed rate equipment notes, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 239 322
Long term debt, fair value 233 305
Floating rate equipment notes, due through 2036    
Debt Instrument [Line Items]    
Long-term debt 434 109
Long term debt, fair value 496 113
Aircraft sale-leaseback transactions, due through 2036    
Debt Instrument [Line Items]    
Long-term debt 2,186 1,648
Long term debt, fair value 2,455 1,738
TrueBlue® senior secured notes, due through 2031    
Debt Instrument [Line Items]    
Long-term debt 1,954 0
Long term debt, fair value 2,095 0
TrueBlue® senior secured term loan facility, due through 2029    
Debt Instrument [Line Items]    
Long-term debt 737 0
Long term debt, fair value 911 0
Unsecured CARES Act Payroll Support Program loan, due through 2030    
Debt Instrument [Line Items]    
Long-term debt 259 259
Long term debt, fair value 201 184
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031    
Debt Instrument [Line Items]    
Long-term debt 144 144
Long term debt, fair value 110 101
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031    
Debt Instrument [Line Items]    
Long-term debt 132 132
Long term debt, fair value 101 93
0.50% convertible senior notes due through 2026    
Debt Instrument [Line Items]    
Long-term debt 323 742
Long term debt, fair value $ 301 657
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 $ 450 0
Long term debt, fair value $ 401 $ 0
Debt instrument, interest rate, stated percentage (in percent) 2.50%