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INCOME TAXES - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Taxes [Line Items] |  |  |
Effective income tax rate | 22.10% | 22.30% | 27.20%
Loss on mark to market of defined benefit plan, tax benefit | $ 255 | $ 784 | $ (1,600)
Loss on mark to market of defined benefit plan | 1,100 | 3,300 | (6,500)
Transformation cost | 178 | 380 | 348
Effective income tax rate reconciliation, nondeductible expense, restructuring charges, amount | 36 | 95 | 83
Share-based payment arrangement, expense | 505 |  |
Amount taxed at higher rate | 121 |  |
Increase in accumulated depreciation, depletion | 76 |  |
Residual value reduction | 18 |  |
Effective income tax rate reconciliation, nondeductible expense, impairment losses, amount |  | 11 | 57
Tax benefit from share-based compensation | $ 95 | $ 105 | $ (28)
Reduction of effective tax rate due to share-based compensation benefits | 0.60% | 0.60% | (1.50%)
Deferred tax expense | $ 531 | $ 1,645 | $ (858)
Income tax benefit | (3,277) | (3,705) | (501)
Income tax holiday, decrease of non-U.S. tax expense | $ 47 | $ 61 | $ 35
Income tax holiday, per share impact (usd per share) | $ 0.05 | $ 0.07 | $ 0.04
Change in valuation allowance | $ 1 | $ 34 | $ 34
Non-U.S. loss carryforwards | 487 |  |
Undistributed earnings of foreign subsidiaries | 5,600 |  |
Indefinitely reinvested undistributed earnings of foreign subsidiaries | 578 |  |
Deferred tax liability | 4,163 | 2,949 |
Gross unrecognized tax benefits that would impact effective tax rate, if recognized | 533 | 479 | 332
Decrease in unrecognized tax benefits is reasonably possible | 175 |  |
Other non-current liabilities |  |  |
Income Taxes [Line Items] |  |  |
Deferred tax liability | 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 | 213 |  |
Federal | Tax Year 2025 |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards subject to expiration | 6 |  |
Federal | Tax Year 2026 |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards subject to expiration | $ 156 |  |

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