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Income Taxes - Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred income tax asset (liability): |  |
Federal and state net operating loss ("NOL") carryforwards | $ 2,644 | $ 2,932
Deferred revenue | 1,845 | 1,783
Employee benefits, including pension, postretirement and medical | 695 | 606
Operating lease liabilities | 1,134 | 1,118
Other financial liabilities | 414 | 141
Interest expense carryforward | 579 | 510
Other | 575 | 576
Less: Valuation allowance | (179) | (199)
Total deferred tax assets | 7,707 | 7,467
Depreciation | (6,782) | (5,844)
Operating lease right-of-use asset | (887) | (881)
Intangibles | (632) | (651)
Total deferred tax liabilities | (8,301) | (7,376)
Net deferred tax liability | (594) |
Net deferred tax asset |  | 91
United Airlines, Inc. |  |
Deferred income tax asset (liability): |  |
Federal and state net operating loss ("NOL") carryforwards | 2,616 | 2,903
Deferred revenue | 1,845 | 1,783
Employee benefits, including pension, postretirement and medical | 695 | 606
Operating lease liabilities | 1,134 | 1,118
Other financial liabilities | 414 | 141
Interest expense carryforward | 579 | 510
Other | 575 | 576
Less: Valuation allowance | (179) | (199)
Total deferred tax assets | 7,679 | 7,438
Depreciation | (6,782) | (5,844)
Operating lease right-of-use asset | (887) | (881)
Intangibles | (632) | (651)
Total deferred tax liabilities | (8,301) | (7,376)
Net deferred tax liability | $ (622) |
Net deferred tax asset |  | $ 62

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