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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax |  |  |  |  |  |
Effective tax rate | 22.20% |  |  | 22.50% | 22.40% | 23.50%
Effective income tax rate reconciliation, excess tax benefit |  |  |  |  | 0.60% | 0.20%
Defined Benefit Plan, Mark to Market Gain (Loss), Tax Effect |  |  | $ 788 |  |  |
Defined Benefit Plan, Mark to Market Gain (Loss) |  |  | $ 3,300 |  |  |
Transformation cost | $ 74 |  |  | $ 44 | $ 308 | $ 201
Income tax benefit from transformation strategy | 20 |  |  | $ 11 | 76 | $ 50
UPS Freight Business | Disposed of by Sale |  |  |  |  |  |
Income Tax |  |  |  |  |  |
Pre-tax gain | 0 | $ 101 |  |  | 35 |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Tax Expense (Benefit) | $ 0 |  |  |  | $ 8 |

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