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INCOME TAXES - Deferred Taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:      
Net operating loss carryforwards $ 799 $ 1,217  
Capital loss carryforward 0 8  
Pension, postretirement and other benefits 1,205 1,488  
Investments 936 806  
Deferred revenue 2,158 2,110  
Lease liabilities 2,816 2,193  
Other 608 709  
Valuation allowance (951) (877) $ (1,176)
Total deferred tax assets 7,571 7,654  
Deferred tax liabilities:      
Depreciation 7,040 5,570  
Operating lease assets 1,369 1,533  
Intangible assets 1,165 1,143  
Other 78 73  
Total deferred tax liabilities 9,652 8,319  
Other noncurrent assets 95 243  
Deferred income taxes, net 2,176 908  
Net deferred tax liabilities $ 2,081 $ 665