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INCOME TAXES - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |  |  |  |
Effective income tax rate |  |  |  | 22.30% | 27.20% | 21.40%
Loss on mark to market of defined benefit plan, tax benefit |  | $ (1,600) | $ (571) | $ 784 |  |
Loss on mark to market of defined benefit plan | $ 3,300 | (6,500) | (2,400) |  |  |
Transformation cost |  |  |  | 380 | $ 348 | $ 255
Effective income tax rate reconciliation, nondeductible expense, restructuring charges, amount |  |  |  | 95 | 83 | 59
Effective income tax rate reconciliation, nondeductible expense, impairment losses, amount |  |  |  | 11 | 57 |
Legal contingencies |  |  | 97 |  |  | 97
Benefit related to legal expenses |  |  | 6 |  |  | 6
Operating lease carryforward |  |  | 68 |  |  | 68
Tax benefit from share-based compensation |  |  |  | $ 105 | $ (28) |
Reduction of effective tax rate due to share-based compensation benefits |  |  |  | 0.60% | (1.50%) |
Deferred tax expense |  |  |  | $ 1,645 | $ (858) | 100
Income tax benefit |  |  |  | (3,705) | (501) | (1,212)
Income tax holiday, decrease of non-U.S. tax expense |  |  |  | $ 61 | $ 35 | $ 27
Income tax holiday, per share impact (usd per share) |  |  |  | $ 0.07 | $ 0.04 | $ 0.03
Change in valuation allowance |  |  |  | $ 34 | $ 34 | $ (58)
Non-U.S. loss carryforwards | 674 |  |  | 674 |  |
Undistributed earnings of foreign subsidiaries | 5,400 |  |  | 5,400 |  |
Indefinitely reinvested undistributed earnings of foreign subsidiaries | 834 |  |  | 834 |  |
Deferred tax liability | 2,949 |  |  | 2,949 |  |
Gross unrecognized tax benefits that would impact effective tax rate, if recognized | 479 | $ 332 | $ 171 | 479 | 332 | $ 171
Other non-current liabilities |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Deferred tax liability | 123 |  |  | 123 |  |
Discontinued Operations | UPS Freight |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Gain (loss) on disposition of business |  |  |  | 46 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | UPS Freight |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  |  |  | $ 686 |
Federal |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards | 185 |  |  | 185 |  |
Operating loss carryforwards subject to expiration | $ 18 |  |  | $ 18 |  |

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