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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Accrued Liabilities, Current [Abstract] |  |
Voluntary Separation Program and severance pay | $ 20 | $ 48
Profit-sharing and savings plans | 54 | 151
Vacation pay | 673 | 657
Health | 201 | 192
Workers compensation | 205 | 178
Property and income taxes | 69 | 53
Interest | 17 | 23
Bonus pay | 97 | 208
Reinsurance payable | 205 | 249
Aircraft maintenance | 118 | 92
Other | 381 | 355
Accrued liabilities | $ 2,040 | $ 2,206

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