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Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax asset (liability): |  |
Federal and state net operating loss ("NOL") carryforwards | $ 601 | $ 1,613
Deferred revenue | 1,069 | 2,096
Employee benefits, including pension, postretirement and medical | 1,051 | 1,662
Alternative minimum tax credit carryforwards |  | 116
Other | 351 | 523
Less: Valuation allowance | (63) | (68)
Total deferred tax assets | 3,009 | 5,942
Depreciation | (2,431) | (3,961)
Intangibles | (803) | (1,326)
Total deferred tax liabilities | (3,234) | (5,287)
Net deferred tax asset |  | 655
Net deferred tax liabilities | (225) |
United Airlines, Inc. |  |
Deferred income tax asset (liability): |  |
Federal and state net operating loss ("NOL") carryforwards | 574 | 1,571
Deferred revenue | 1,069 | 2,096
Employee benefits, including pension, postretirement and medical | 1,051 | 1,662
Alternative minimum tax credit carryforwards |  | 116
Other | 351 | 522
Less: Valuation allowance | (63) | (68)
Total deferred tax assets | 2,982 | 5,899
Depreciation | (2,431) | (3,961)
Intangibles | (803) | (1,326)
Total deferred tax liabilities | (3,234) | (5,287)
Net deferred tax asset |  | $ 612
Net deferred tax liabilities | $ (252) |

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