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ASSETS HELD FOR SALE - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Jan. 24, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Actuarial gain | $ (3,700) |  |  |  |  |  |
Defined benefit plan, net actuarial gain (loss) | 2,100 |  |  |  |  |  |
UPS Freight Business | Held-for-sale |  |  |  |  |  |  |
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 |  |  |
UPS Freight Business | Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash proceeds | $ 848 |  |  |  |  |  |
Pre-tax gain |  | $ 0 | $ 101 |  | $ 35 |  |
Gain, after tax |  |  | $ 77 |  | $ 27 |  |

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