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INCOME TAXES - Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred income tax asset (liability):    
Federal and state net operating loss ("NOL") carryforwards $ 2,149 $ 2,644
Deferred revenue 1,865 1,845
Employee benefits, including pension, postretirement and medical 608 695
Operating lease liabilities 1,110 1,134
Other financial liabilities 517 414
Interest expense carryforward 467 579
Other 565 575
Less: Valuation allowance (208) (179)
Total deferred tax assets 7,073 7,707
Depreciation (7,171) (6,782)
Operating lease right-of-use asset (863) (887)
Intangibles (619) (632)
Total deferred tax liabilities (8,653) (8,301)
Net deferred tax liability (1,580) (594)
United Airlines, Inc.    
Deferred income tax asset (liability):    
Federal and state net operating loss ("NOL") carryforwards 2,119 2,616
Deferred revenue 1,865 1,845
Employee benefits, including pension, postretirement and medical 608 695
Operating lease liabilities 1,110 1,134
Other financial liabilities 517 414
Interest expense carryforward 467 579
Other 565 575
Less: Valuation allowance (208) (179)
Total deferred tax assets 7,043 7,679
Depreciation (7,171) (6,782)
Operating lease right-of-use asset (863) (887)
Intangibles (619) (632)
Total deferred tax liabilities (8,653) (8,301)
Net deferred tax liability $ (1,610) $ (622)