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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2024
Income Tax Disclosure [Abstract] |
Income Tax Provision (Benefit) Differed from Amounts Computed at the Statutory Federal Income Tax Rate and Significant Components | The income tax provision differed from amounts computed at the statutory federal income tax rate and consisted of the following significant components (in millions):
|  | 2024 |  | 2023 |  | 2022
Income tax provision at statutory rate |  | $ | 875 |  |  | $ | 711 |  |  | $ | 208 |
State income tax provision, net of federal income tax benefit |  | 56 |  |  | 46 |  |  | 13 |
Nondeductible employee meals |  | 16 |  |  | 15 |  |  | 12 |
Nondeductible transportation fringe benefit |  | 16 |  |  | 13 |  |  | 10 |
Valuation allowance |  | 29 |  |  | (21) |  |  | (10) |
Other, net |  | 27 |  |  | 5 |  |  | 20 |
Income tax expense |  | $ | 1,019 |  |  | $ | 769 |  |  | $ | 253 |
Current |  | $ | 84 |  |  | $ | 13 |  |  | $ | 5 |
Deferred |  | 935 |  |  | 756 |  |  | 248 |
Income tax expense |  | $ | 1,019 |  |  | $ | 769 |  |  | $ | 253 |
Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities | Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2024 and 2023 were as follows (in millions):
|  | UAL |  | United
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Deferred income tax asset (liability): |  |  |  |  |  |  |  |
Federal and state net operating loss ("NOL") carryforwards |  | $ | 2,149 |  |  | $ | 2,644 |  |  | $ | 2,119 |  |  | $ | 2,616 |
Deferred revenue |  | 1,865 |  |  | 1,845 |  |  | 1,865 |  |  | 1,845 |
Employee benefits, including pension, postretirement and medical |  | 608 |  |  | 695 |  |  | 608 |  |  | 695 |
Operating lease liabilities |  | 1,110 |  |  | 1,134 |  |  | 1,110 |  |  | 1,134 |
Other financial liabilities |  | 517 |  |  | 414 |  |  | 517 |  |  | 414 |
Interest expense carryforward |  | 467 |  |  | 579 |  |  | 467 |  |  | 579 |
Other |  | 565 |  |  | 575 |  |  | 565 |  |  | 575 |
Less: Valuation allowance |  | (208) |  |  | (179) |  |  | (208) |  |  | (179) |
Total deferred tax assets |  | $ | 7,073 |  |  | $ | 7,707 |  |  | $ | 7,043 |  |  | $ | 7,679 |
Depreciation |  | $ | (7,171) |  |  | $ | (6,782) |  |  | $ | (7,171) |  |  | $ | (6,782) |
Operating lease right-of-use asset |  | (863) |  |  | (887) |  |  | (863) |  |  | (887) |
Intangibles |  | (619) |  |  | (632) |  |  | (619) |  |  | (632) |
Total deferred tax liabilities |  | $ | (8,653) |  |  | $ | (8,301) |  |  | $ | (8,653) |  |  | $ | (8,301) |
Net deferred tax asset (liability) |  | $ | (1,580) |  |  | $ | (594) |  |  | $ | (1,610) |  |  | $ | (622) |

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