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INCOME TAXES - Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Disclosure [Abstract] |  |
Fixed assets and capitalized software | $ (5,914) | $ (5,974)
Operating lease right-of-use assets | (943) | (1,017)
Other | (612) | (605)
Deferred tax liabilities | (7,469) | (7,596)
Pension and postretirement benefits | 1,474 | 1,304
Loss and credit carryforwards | 308 | 232
Insurance reserves | 646 | 626
Accrued employee compensation | 352 | 354
Operating lease liabilities | 1,021 | 1,073
Other | 367 | 480
Deferred tax assets | 4,168 | 4,069
Deferred tax assets valuation allowance | (182) | (119)
Deferred tax asset (net of valuation allowance) | 3,986 | 3,950
Net deferred tax asset (liability) | (3,483) | (3,646)
Amounts recognized in our consolidated balance sheets: |  |
Deferred tax assets | 112 | 126
Deferred tax liabilities | (3,595) | (3,772)
Net deferred tax asset (liability) | $ (3,483) | $ (3,646)

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