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Income Taxes - Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred income tax asset (liability):    
Federal and state net operating loss ("NOL") carryforwards $ 2,476 $ 695
Deferred revenue 1,409 1,287
Employee benefits, including pension, postretirement and medical 1,103 715
Operating lease liabilities 1,247 1,256
Sale leaseback liabilities 260 0
Other 362 165
Less: Valuation allowance (247) (58)
Total deferred tax assets 6,610 4,060
Depreciation (4,789) (4,011)
Operating lease right-of-use asset (1,028) (1,061)
Intangibles (662) (724)
Total deferred tax liabilities (6,479) (5,796)
Net deferred tax asset 131  
Net deferred tax asset (liability)   (1,736)
United Airlines, Inc.    
Deferred income tax asset (liability):    
Federal and state net operating loss ("NOL") carryforwards 2,448 668
Deferred revenue 1,409 1,287
Employee benefits, including pension, postretirement and medical 1,103 715
Operating lease liabilities 1,247 1,256
Sale leaseback liabilities 260 0
Other 362 165
Less: Valuation allowance (247) (58)
Total deferred tax assets 6,582 4,033
Depreciation (4,789) (4,011)
Operating lease right-of-use asset (1,028) (1,061)
Intangibles (662) (724)
Total deferred tax liabilities (6,479) (5,796)
Net deferred tax asset $ 103  
Net deferred tax asset (liability)   $ (1,763)