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INCOME TAXES - Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Deferred income tax asset (liability): |  |
Federal and state net operating loss ("NOL") carryforwards | $ 2,149 | $ 2,644
Deferred revenue | 1,865 | 1,845
Employee benefits, including pension, postretirement and medical | 608 | 695
Operating lease liabilities | 1,110 | 1,134
Other financial liabilities | 517 | 414
Interest expense carryforward | 467 | 579
Other | 565 | 575
Less: Valuation allowance | (208) | (179)
Total deferred tax assets | 7,073 | 7,707
Depreciation | (7,171) | (6,782)
Operating lease right-of-use asset | (863) | (887)
Intangibles | (619) | (632)
Total deferred tax liabilities | (8,653) | (8,301)
Net deferred tax liability | (1,580) | (594)
United Airlines, Inc. |  |
Deferred income tax asset (liability): |  |
Federal and state net operating loss ("NOL") carryforwards | 2,119 | 2,616
Deferred revenue | 1,865 | 1,845
Employee benefits, including pension, postretirement and medical | 608 | 695
Operating lease liabilities | 1,110 | 1,134
Other financial liabilities | 517 | 414
Interest expense carryforward | 467 | 579
Other | 565 | 575
Less: Valuation allowance | (208) | (179)
Total deferred tax assets | 7,043 | 7,679
Depreciation | (7,171) | (6,782)
Operating lease right-of-use asset | (863) | (887)
Intangibles | (619) | (632)
Total deferred tax liabilities | (8,653) | (8,301)
Net deferred tax liability | $ (1,610) | $ (622)

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