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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Finance Lease Obligations And The Related Weighted Average Interest Rate (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Present value of future minimum lease payment	$ 116	$ 0
Finance leases	5.80%	0.00%
Total debt and capital lease obligations	$ 8,618	$ 4,740
Less: Debt issuance costs	(79)	(24)
Less: Current maturities	(392)	(307)
Long-term debt and finance lease obligations	8,147	4,409
Fixed rate special facility bonds, due through 2036
Debt Instrument [Line Items]
Secured debt	$ 43	$ 43
Weighted average interest rate	5.00%	5.00%
2019-1 Series AA, due through 2032
Debt Instrument [Line Items]
Secured debt	$ 452	$ 481
Weighted average interest rate	2.80%	2.80%
2019-1 Series A, due through 2028
Debt Instrument [Line Items]
Secured debt	$ 141	$ 150
Weighted average interest rate	3.00%	3.00%
2019-1 Series B, due through 2027
Debt Instrument [Line Items]
Secured debt	$ 58	$ 71
Weighted average interest rate	8.10%	8.10%
2020-1 Series A, due through 2032
Debt Instrument [Line Items]
Secured debt	$ 469	$ 511
Weighted average interest rate	4.10%	4.10%
2020-1 Series B, due through 2028
Debt Instrument [Line Items]
Secured debt	$ 100	$ 118
Weighted average interest rate	7.80%	7.80%
Fixed rate equipment notes, due through 2028
Debt Instrument [Line Items]
Secured debt	$ 219	$ 323
Weighted average interest rate	4.30%	4.30%
Floating rate equipment notes, due through 2036
Debt Instrument [Line Items]
Secured debt	$ 742	$ 109
Weighted average interest rate	7.40%	7.40%
Aircraft failed sale-leaseback transactions, due through 2036
Debt Instrument [Line Items]
Secured debt	$ 2,221	$ 1,649
Weighted average interest rate	7.00%	7.00%
TrueBlue® senior secured notes, due through 2031
Debt Instrument [Line Items]
Weighted average interest rate	9.90%	0.00%
Carrying Value	$ 1,988	$ 0
TrueBlue® senior secured term loan facility, due through 2029
Debt Instrument [Line Items]
Weighted average interest rate	9.90%	0.00%
Carrying Value	$ 749	$ 0
Unsecured CARES Act Payroll Support Program loan, due through 2030
Debt Instrument [Line Items]
Weighted average interest rate	2.00%	2.00%
Unsecured debt	$ 259	$ 259
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031
Debt Instrument [Line Items]
Weighted average interest rate	2.00%	2.00%
Unsecured debt	$ 144	$ 144
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031
Debt Instrument [Line Items]
Weighted average interest rate	2.00%	2.00%
Unsecured debt	$ 132	$ 132
0.50% convertible senior notes, due through 2026
Debt Instrument [Line Items]
Weighted average interest rate	0.50%	0.50%
Carrying Value	$ 325	$ 750
Debt instrument, interest rate, stated percentage	0.50%
2.50% convertible senior notes, due through 2029
Debt Instrument [Line Items]
Weighted average interest rate	2.50%	0.00%
Carrying Value	$ 460	$ 0
Debt instrument, interest rate, stated percentage	2.50%

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