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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)