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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