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Income Taxes - Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred income tax asset (liability): |  |
Federal and state net operating loss (NOL) carryforwards | $ 398 | $ 601
Deferred revenue | 1,232 | 1,090
Employee benefits, including pension, postretirement and medical | 885 | 1,051
Other | 408 | 351
Less: Valuation allowance | (59) | (63)
Total deferred tax assets | 2,864 | 3,030
Depreciation | (2,929) | (2,431)
Intangibles | (749) | (803)
Total deferred tax liabilities | (3,678) | (3,234)
Net deferred tax liability | (814) | (204)
United Airlines, Inc. |  |
Deferred income tax asset (liability): |  |
Federal and state net operating loss (NOL) carryforwards | 372 | 574
Deferred revenue | 1,232 | 1,090
Employee benefits, including pension, postretirement and medical | 885 | 1,051
Other | 406 | 351
Less: Valuation allowance | (59) | (63)
Total deferred tax assets | 2,836 | 3,003
Depreciation | (2,929) | (2,431)
Intangibles | (749) | (803)
Total deferred tax liabilities | (3,678) | (3,234)
Net deferred tax liability | $ (842) | $ (231)

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