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Income Taxes - Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax asset (liability): |  |
Federal and state net operating loss (NOL) carryforwards | $ 695 | $ 398
Deferred revenue | 1,287 | 1,232
Employee benefits, including pension, postretirement and medical | 715 | 885
Operating lease liabilities | 1,256 | 1,338
Other | 165 | 229
Less: Valuation allowance | (58) | (59)
Total deferred tax assets | 4,060 | 4,023
Depreciation | (4,011) | (2,929)
Operating lease right-of-use asset | (1,061) | (1,173)
Intangibles | (724) | (749)
Total deferred tax liabilities | (5,796) | (4,851)
Net deferred tax liability | (1,736) | (828)
United Airlines, Inc. |  |
Deferred income tax asset (liability): |  |
Federal and state net operating loss (NOL) carryforwards | 668 | 371
Deferred revenue | 1,287 | 1,232
Employee benefits, including pension, postretirement and medical | 715 | 885
Operating lease liabilities | 1,256 | 1,338
Other | 165 | 229
Less: Valuation allowance | (58) | (59)
Total deferred tax assets | 4,033 | 3,996
Depreciation | (4,011) | (2,929)
Operating lease right-of-use asset | (1,061) | (1,173)
Intangibles | (724) | (749)
Total deferred tax liabilities | (5,796) | (4,851)
Net deferred tax liability | $ (1,763) | $ (855)

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