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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailments and settlements of benefit obligations |  |  |  | $ 34,000,000
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Investment income (expense) and other
Curtailment of benefit obligation, after tax |  |  |  | $ 24,000,000
Health care cost trends, initial annual rate increase |  | 7.50% |  |
Health care cost trends, an ultimate trend rate |  | 4.50% |  |
Employer contributions |  | $ 1,524,000,000 | $ 1,393,000,000 | $ 2,342,000,000
Actuarial gain (loss) |  | 2,500,000,000 | (2,400,000,000) |
Defined benefit plan, actuarial gain (loss), discount rates |  | $ 2,800,000,000 | $ (2,300,000,000) |
Service cost discount rate |  | 5.85% | 5.40% | 5.77%
Defined benefit plan, actuarial loss, demographic and assumption changes |  | $ 300,000,000 | $ 100,000,000 |
Common stock held in plan assets (in shares) |  | 0 | 0 |
Hedge funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unfunded commitments to limited partnerships |  | $ 0 |  |
Private Equity and Real Estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unfunded commitments to limited partnerships |  | 2,700,000,000 |  |
Employee Defined Contribution Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions charged to expense |  | 161,000,000 | $ 161,000,000 | $ 153,000,000
UPS 401(k) Savings Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions charged to expense |  | 359,000,000 | 380,000,000 | 83,000,000
Transition contributions |  | 108,000,000 | 128,000,000 | 0
Defined Contribution Money Purchase Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions charged to expense |  | 135,000,000 | 132,000,000 | $ 119,000,000
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation for pension plans |  | 48,000,000,000.0 | 49,200,000,000 |
Employer contributions |  | 37,000,000 | 35,000,000 |
Postemployment Retirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation for pension plans |  | 1,900,000,000 | 2,000,000,000.0 |
Postretirement Medical Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | $ 264,000,000 | $ 51,000,000 |
Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Postretirement medical plans service minimum eligibility year |  | 10 years |  |
Postretirement medical plans service minimum eligibility age |  | 55 years |  |
Duration for unfunded commitments to be contributed |  | 3 years |  |
Minimum | Private Equity and Real Estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Redemption notice period, lower limit |  | 10 years |  |
Minimum | UPS 401(k) Savings Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution, percent of eligible compensation |  | 5.00% | 3.00% |
Minimum | UPS 401(k) Savings Plan | Subsequent Event |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution, percent of eligible compensation | 3.00% |  |  |
Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Duration for unfunded commitments to be contributed |  | 6 years |  |
Maximum | Private Equity and Real Estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Redemption notice period, upper limit |  | 15 years |  |
Maximum | UPS 401(k) Savings Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution, percent of eligible compensation |  | 8.00% | 8.00% |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Weighted-average duration of liability for future policy benefit, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 + Details
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