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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
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 (benefit) differed from amounts computed at the statutory federal income tax rate and consisted of the following significant components (in millions):
|  | 2023 |  | 2022 |  | 2021
Income tax provision (benefit) at statutory rate |  | $ | 711 |  |  | $ | 208 |  |  | $ | (537) |
State income tax provision (benefit), net of federal income tax benefit |  | 46 |  |  | 13 |  |  | (34) |
Nondeductible employee meals |  | 15 |  |  | 12 |  |  | 7 |
Nondeductible transportation fringe benefit |  | 13 |  |  | 10 |  |  | 8 |
Valuation allowance |  | (21) |  |  | (10) |  |  | (38) |
Other, net |  | 5 |  |  | 20 |  |  | 1 |
Income tax expense (benefit) |  | $ | 769 |  |  | $ | 253 |  |  | $ | (593) |
Current |  | $ | 13 |  |  | $ | 5 |  |  | $ | (10) |
Deferred |  | 756 |  |  | 248 |  |  | (583) |
Income tax expense (benefit) |  | $ | 769 |  |  | $ | 253 |  |  | $ | (593) |
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, 2023 and 2022 were as follows (in millions):
|  | UAL |  | United
|  | 2023 |  | 2022 |  | 2023 |  | 2022
Deferred income tax asset (liability): |  |  |  |  |  |  |  |
Federal and state net operating loss ("NOL") carryforwards |  | $ | 2,644 |  |  | $ | 2,932 |  |  | $ | 2,616 |  |  | $ | 2,903 |
Deferred revenue |  | 1,845 |  |  | 1,783 |  |  | 1,845 |  |  | 1,783 |
Employee benefits, including pension, postretirement and medical |  | 695 |  |  | 606 |  |  | 695 |  |  | 606 |
Operating lease liabilities |  | 1,134 |  |  | 1,118 |  |  | 1,134 |  |  | 1,118 |
Other financial liabilities |  | 414 |  |  | 141 |  |  | 414 |  |  | 141 |
Interest expense carryforward |  | 579 |  |  | 510 |  |  | 579 |  |  | 510 |
Other |  | 575 |  |  | 576 |  |  | 575 |  |  | 576 |
Less: Valuation allowance |  | (179) |  |  | (199) |  |  | (179) |  |  | (199) |
Total deferred tax assets |  | $ | 7,707 |  |  | $ | 7,467 |  |  | $ | 7,679 |  |  | $ | 7,438 |
Depreciation |  | $ | (6,782) |  |  | $ | (5,844) |  |  | $ | (6,782) |  |  | $ | (5,844) |
Operating lease right-of-use asset |  | (887) |  |  | (881) |  |  | (887) |  |  | (881) |
Intangibles |  | (632) |  |  | (651) |  |  | (632) |  |  | (651) |
Total deferred tax liabilities |  | $ | (8,301) |  |  | $ | (7,376) |  |  | $ | (8,301) |  |  | $ | (7,376) |
Net deferred tax asset (liability) |  | $ | (594) |  |  | $ | 91 |  |  | $ | (622) |  |  | $ | 62 |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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