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Income Taxes - Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax asset (liability): |  |
Federal and state net operating loss ("NOL") carryforwards | $ 2,229 | $ 2,476
Deferred revenue | 2,349 | 1,409
Employee benefits, including pension, postretirement and medical | 986 | 1,103
Operating lease liabilities | 1,272 | 1,247
Other financing liabilities | 327 | 260
Other | 535 | 362
Less: Valuation allowance | (210) | (247)
Total deferred tax assets | 7,488 | 6,610
Depreciation | (5,122) | (4,789)
Operating lease right-of-use asset | (1,051) | (1,028)
Intangibles | (656) | (662)
Total deferred tax liabilities | (6,829) | (6,479)
Net deferred tax asset | 659 | 131
United Airlines, Inc. |  |
Deferred income tax asset (liability): |  |
Federal and state net operating loss ("NOL") carryforwards | 2,201 | 2,448
Deferred revenue | 2,349 | 1,409
Employee benefits, including pension, postretirement and medical | 986 | 1,103
Operating lease liabilities | 1,272 | 1,247
Other financing liabilities | 327 | 260
Other | 535 | 362
Less: Valuation allowance | (210) | (247)
Total deferred tax assets | 7,460 | 6,582
Depreciation | (5,122) | (4,789)
Operating lease right-of-use asset | (1,051) | (1,028)
Intangibles | (656) | (662)
Total deferred tax liabilities | (6,829) | (6,479)
Net deferred tax asset | $ 631 | $ 103

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