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Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred income tax asset (liability): |  |
Federal and state net operating loss ("NOL") carryforwards | $ 1,613 | $ 2,897
Deferred revenue | 2,096 | 2,160
Employee benefits, including pension, postretirement and medical | 1,662 | 1,662
Alternative minimum tax ("AMT") credit carryforwards | 116 | 232
Other | 523 | 566
Less: Valuation allowance | (68) | (48)
Total deferred tax assets | 5,942 | 7,469
Depreciation | (3,961) | (3,921)
Intangibles | (1,326) | (1,511)
Total deferred tax liabilities | (5,287) | (5,432)
Net deferred tax asset | 655 | 2,037
United Airlines, Inc. |  |
Deferred income tax asset (liability): |  |
Federal and state net operating loss ("NOL") carryforwards | 1,571 | 2,855
Deferred revenue | 2,096 | 2,160
Employee benefits, including pension, postretirement and medical | 1,662 | 1,662
Alternative minimum tax ("AMT") credit carryforwards | 116 | 232
Other | 522 | 566
Less: Valuation allowance | (68) | (48)
Total deferred tax assets | 5,899 | 7,427
Depreciation | (3,961) | (3,921)
Intangibles | (1,326) | (1,511)
Total deferred tax liabilities | (5,287) | (5,432)
Net deferred tax asset | $ 612 | $ 1,995

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