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INCOME TAXES - Deferred Tax Liabilities and Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Deferred Tax Liabilities, Leasing Arrangements | $ (730) | $ (685)
Fixed assets and capitalized software | (5,355) | (4,720)
Other | (501) | (538)
Deferred tax liabilities | (6,586) | (5,943)
Pension and postretirement benefits | 3,994 | 2,522
Loss and credit carryforwards | 325 | 328
Insurance reserves | 535 | 413
Stock compensation | 183 | 249
Accrued employee compensation | 583 | 287
Operating lease liabilities | 736 | 691
Other | 357 | 205
Deferred tax assets | 6,713 | 4,695
Deferred tax assets valuation allowance | (88) | (54)
Deferred tax asset (net of valuation allowance) | 6,625 | 4,641
Net deferred tax asset (liability) | (39) | (1,302)
Deferred income tax assets | 527 | 330
Deferred Income Tax Liabilities, Net | 488 | 1,632
Amounts recognized in the consolidated balance sheets: |  |
Net deferred tax asset (liability) | $ (39) | $ (1,302)

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