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ASSETS HELD FOR SALE - Additional Information (Details) - UPS Freight Business - Held-for-sale - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Jan. 24, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Divestiture consideration |  |  | $ 800
Impairment charges |  | $ 686 |
Impairment charges, net of tax |  | 629 |
Goodwill impairment charge |  | 494 |
Increase in valuation allowance | $ 66 | $ 192 |
Increase in valuation allowance, after tax | $ 50 |  |

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