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Income Taxes - Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred income tax asset (liability):    
Federal and state net operating loss (NOL) carryforwards $ 695 $ 398
Deferred revenue 1,287 1,232
Employee benefits, including pension, postretirement and medical 715 885
Operating lease liabilities 1,256 1,338
Other 165 229
Less: Valuation allowance (58) (59)
Total deferred tax assets 4,060 4,023
Depreciation (4,011) (2,929)
Operating lease right-of-use asset (1,061) (1,173)
Intangibles (724) (749)
Total deferred tax liabilities (5,796) (4,851)
Net deferred tax liability (1,736) (828)
United Airlines, Inc.    
Deferred income tax asset (liability):    
Federal and state net operating loss (NOL) carryforwards 668 371
Deferred revenue 1,287 1,232
Employee benefits, including pension, postretirement and medical 715 885
Operating lease liabilities 1,256 1,338
Other 165 229
Less: Valuation allowance (58) (59)
Total deferred tax assets 4,033 3,996
Depreciation (4,011) (2,929)
Operating lease right-of-use asset (1,061) (1,173)
Intangibles (724) (749)
Total deferred tax liabilities (5,796) (4,851)
Net deferred tax liability $ (1,763) $ (855)