Employer ID No. Entity Tax Identification Number Participant rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Adjustment for deemed distribution income from participant loans EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Deemed Distribution Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Maximum annual after-tax contribution amount EBP, Participant Contribution, After Tax, Maximum Annual Compensation, Amount EBP, Participant Contribution, After Tax, Maximum Annual Contribution, Amount Deemed distribution EBP, Reconciliation to Form 5500, Note Receivable, Deemed Distribution EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Participants maximum annual contribution as percent of pre-tax compensation EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage EBP, Fully Benefit-Responsive Investment Contract [Table] EBP, Fully Benefit-Responsive Investment Contract [Table] Investments in Self-Managed Accounts EBP, Self-Directed Brokerage Account [Member] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] Minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Transition for certain participants hired before Dec 31, 2007 EBP, Hired Before December 31, 2007 [Member] EBP, Hired Before December 31, 2007 EBP, Fully Benefit-Responsive Investment Contract [Abstract] Eligible before Aug 1, 2024 EBP, Eligible Before August 1, 2024 [Member] EBP, Eligible Before August 1, 2024 Participant-directed investments — at fair value (Note 3) Investments at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value OTHER CHANGES IN NET ASSETS — Net appreciation in fair value of investments EBP, Change In Net Asset Available For Benefit, Increase (Decrease), Other EBP, Change In Net Asset Available For Benefit, Increase (Decrease), Other Self-managed accounts - U.S. government securities EBP, Self-Directed Brokerage Account, US Government Securities [Member] EBP, Self-Directed Brokerage Account, US Government Securities Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Reconciliation of financial statements to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] INVESTMENTS IN INSURANCE CONTRACTS EBP, Fully Benefit-Responsive Investment Contract [Text Block] UPS contribution based on vested service and business unit, percentage EBP, Employer Contribution, Retirement, Percent Of Eligible Pay, Percentage EBP, Employer Contribution, Retirement, Percent Of Eligible Pay, Percentage EBP, Investment, Fair Value and NAV [Abstract] Common and collective trusts - Multi-asset funds Common Collective Trust, Multi-Asset Funds [Member] Common Collective Trust, Multi-Asset Funds Transfers from Plan (Note 1) EBP, Change In Net Asset Available For Benefit, Decrease From Transfers From Plan EBP, Change In Net Asset Available For Benefit, Decrease From Transfers From Plan Excess Contributions Payable EBP, Excess Contribution Payable [Policy Text Block] Total assets EBP, Asset ASSETS: EBP, Asset [Abstract] Eligible on or after Jan 1, 2025 EBP, Eligible On Or After January 1, 2025 [Member] EBP, Eligible On Or After January 1, 2025 Statistical Measurement [Axis] Statistical Measurement [Axis] INCREASE IN PLAN ASSETS ATTRIBUTED TO: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment of Benefits EBP, Payment to Participant [Policy Text Block] Total liabilities EBP, Liability Amendment Flag Amendment Flag Adjustment for deemed distributions from participant loans EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Deemed Distribution Total administrative expenses EBP, Administrative Expense EBP, Administrative Expense Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Number of shares held by Plan Number of shares/units EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] Schedule of investments measured at fair value EBP, Investment, Fair Value and NAV [Table Text Block] Interest credited to participants in Stable Value Fund EBP, Stable Value Fund, Interest Rate EBP, Stable Value Fund, Interest Rate Investments [Domain] Investments [Domain] EBP 004 EBP 004 [Member] EBP 004 FORM 5500, SCHEDULE H, PART IV, LINE 4i — SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Adjustment from contract value to fair value for synthetic GICs EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Contract Value to Current Value Employer contributions Matching contributions amount EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Common and collective trusts - Lifestyle funds Common Collective Trust, Lifestyle Funds [Member] Common Collective Trust, Lifestyle Funds Minimum Minimum [Member] Investment income and other EBP, Investment Income, Receivable Investment Type [Axis] Investment Type [Axis] Interest and dividend income EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Automatic enrollment period EBP, Automatic Enrollment Period EBP, Automatic Enrollment Period UPS Retirement EBP, UPS Retirement [Member] EBP, UPS Retirement Participant contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover EBP, Plan Contribution Component [Axis] EBP, Plan Contribution Component [Axis] EBP, Plan Contribution Component Recent Accounting Pronouncements EBP, Recent Accounting Pronouncements [Policy Text Block] EBP, Recent Accounting Pronouncements EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan No. EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] DESCRIPTION OF THE PLAN EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Adjustment from contract value to fair value for synthetic GICs EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Contract Value to Current Value Adjustment EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Employer Contributions Receivable EBP, Contribution [Policy Text Block] EBP, Schedule of Asset Held for Investment [Abstract] UPS contributions vested, percentage EBP, Employer Contribution Vesting Percentage EBP, Employer Contribution Vesting Percentage EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Self-managed accounts - Mutual funds EBP, Self-Directed Brokerage Account, Mutual Fund [Member] EBP, Self-Directed Brokerage Account, Mutual Fund Total additions EBP, Change in Net Asset Available for Benefit, Increase Automatic deferral rate annual increase, percentage EBP, Participant Contribution, Automatic, Deferral Rate Annual Increase EBP, Participant Contribution, Automatic, Deferral Rate Annual Increase Self-managed accounts - Interest-bearing deposits EBP, Self-Directed Brokerage Account, Interest-Bearing Deposits [Member] EBP, Self-Directed Brokerage Account, Interest-Bearing Deposits Investment, Identifier [Axis] Investment, Identifier [Axis] Eligible on or before Dec 31, 2007 EBP, Eligible On Or Before December 31, 2007 [Member] EBP, Eligible On Or Before December 31, 2007 Administrative expenses (Note 2) EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Total notes receivable from participants and investments at fair value EBP, Asset Held for Investment General loan, borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term Document Information [Line Items] Document Information [Line Items] Interest-bearing cash Interest-Bearing Deposits [Member] Eligible on or after Jan 1, 2023 EBP, Eligible On Or After January 1, 2023 [Member] EBP, Eligible On Or After January 1, 2023 Vesting service period EBP, Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period Plan administrator fees Fees paid by Plan for recordkeeping and trustee fees EBP, Administrative Expense, Plan Administrator Fees EBP, Administrative Expense, Plan Administrator Fees Participant contribution deferral, discretionary day payout, percentage EBP, Participant Contribution, Deferral, Discretionary Day Payout, Percentage EBP, Participant Contribution, Deferral, Discretionary Day Payout, Percentage Participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Personal advisor fees Fees paid by Plan for personal advisor services EBP, Administrative Expense, Personal Advisor Fees EBP, Administrative Expense, Personal Advisor Fees Eligible on or after Aug 1, 2024 EBP, Eligible On Or After August 1, 2024 [Member] EBP, Eligible On Or After August 1, 2024 Total income per Form 5500 EBP, Form 5500 Caption, Net Income (Loss) EBP, Fully Benefit-Responsive Investment Contract [Line Items] EBP, Fully Benefit-Responsive Investment Contract [Line Items] Participant contribution deferral, Management Incentive Program (MIP), percentage EBP, Participant Contribution, Deferral, Management Incentive Program, Percentage EBP, Participant Contribution, Deferral, Management Incentive Program, Percentage EBP, Tax Status [Table] EBP, Tax Status [Table] NET INCREASE IN NET ASSETS Net increase in net assets available for benefits per the financial statements EBP, Change in Net Asset Available for Benefit, Increase (Decrease) PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Accounts payable EBP, Excess Contribution Payable Total receivables EBP, Receivable Employer contributions EBP, Employer Contribution, Receivable Use of Estimates and Risks and Uncertainties EBP, Use Of Estimate And Risk And Uncertainty [Policy Text Block] EBP, Use Of Estimate And Risk And Uncertainty Automatic deferral rate, percentage EBP, Participant Contribution, Automatic, Deferral Rate Benefits to Plan participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Investments at current value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Employee Eligibility Status [Axis] EBP, Employee Eligibility Status [Axis] EBP, Employee Eligibility Status Common and collective trusts - U.S. government securities Common Collective Trust, US Government Securities [Member] Common Collective Trust, US Government Securities EBP, Statement of Net Asset Available for Benefit [Abstract] Guaranteed Investment Contracts Guaranteed Investment Contract [Member] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Eligible on or after Jul 1, 2016 but before Jan 1, 2023 EBP, Eligible On Or After July 1, 2016 But Before January 1, 2023 [Member] EBP, Eligible On Or After July 1, 2016 But Before January 1, 2023 Participant contributions vested, percentage EBP, Participant Contribution Vesting Percentage EBP, Participant Contribution Vesting Percentage EBP, Tax Status [Abstract] UPS stock fund United Parcel Service, Inc. EBP, Employer, Common Stock Fund [Member] Common and collective trusts - Equity funds Common Collective Trust, Equity Funds [Member] Common Collective Trust, Equity Funds EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] Plan name EBP, Plan Name EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Savings Plus EBP, Savings Plus [Member] EBP, Savings Plus Administrative Expenses EBP, Expense [Policy Text Block] RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Various notes receivable from participants EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Participant contributions EBP, Participant Contribution, Receivable Totals, Level 1, 2, and 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Document Type Document Type Entity Central Index Key Entity Central Index Key Eligible before Jan 1, 2025 EBP, Eligible Before January 1, 2025 [Member] EBP, Eligible Before January 1, 2025 Participant loan interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Common and Collective Trusts Common Collective Trust [Member] Eligible on or after Jan 1, 2023 but before Jan 1, 2025 EBP, Eligible On Or After January 1, 2023 But Before January 1, 2025 [Member] EBP, Eligible On Or After January 1, 2023 But Before January 1, 2025 EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Investment advisory and management fees Fees paid by Plan for investment management services EBP, Administrative Expense, Investment Advisory And Management Fees EBP, Administrative Expense, Investment Advisory And Management Fees DECREASE IN PLAN ASSETS ATTRIBUTED TO: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Forfeitures used to reduce employer contributions EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Self-managed accounts - Corporate debt securities EBP, Self-Directed Brokerage Account, Corporate Debt Securities [Member] EBP, Self-Directed Brokerage Account, Corporate Debt Securities Common and collective trusts - Fixed-income funds Common Collective Trust, Fixed-Income Funds [Member] Common Collective Trust, Fixed-Income Funds Notes receivable from participants EBP, Note Receivable from Participant Residential loan, borrowing term EBP, Note Receivable From Participant, Residential Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, Residential Loan, Maximum Borrowing Term Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name LIABILITIES: EBP, Liability [Abstract] Participant contribution deferral, Sales Incentive Program Bonus, percentage EBP, Participant Contribution, Deferral, Sales Incentive Program Bonus, Percentage EBP, Participant Contribution, Deferral, Sales Incentive Program Bonus, Percentage Investment at cost basis EBP, Investment, Excluding Plan Interest in Master Trust, Cost Schedule of administrative fees EBP, Schedule Of Administrative Fees [Table Text Block] EBP, Schedule Of Administrative Fees FEDERAL INCOME TAX STATUS EBP, Tax Status [Text Block] Participants maximum annual catch-up contribution as percent of pre-tax compensation EBP, Participant Contribution, Pretax, Maximum Catch Up Compensation to Total Compensation, Percentage EBP, Participant Contribution, Pretax, Maximum Catch Up Compensation to Total Compensation, Percentage Participants additional annual contribution limit as percent of after-tax compensation EBP, Participant Contribution, After tax, Maximum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, After tax, Maximum Annual Compensation to Total Compensation, Percentage Maximum borrowing to account balance, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Document Information [Table] Document Information [Table] Maximum compensation threshold for after-tax contributions EBP, Participant Contribution, After-Tax, Maximum Compensation Threshold EBP, Participant Contribution, After-Tax, Maximum Compensation Threshold Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] NET ASSETS AVAILABLE FOR BENEFITS NET ASSETS AVAILABLE FOR BENEFITS — Beginning of year NET ASSETS AVAILABLE FOR BENEFITS — End of year Net assets available for benefits per the financial statements EBP, Net Asset Available for Benefit Total investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair and Contract Value Entity [Domain] Entity [Domain] Self-managed accounts - Common Stock EBP, Self-Directed Brokerage Account, Common Stock [Member] EBP, Self-Directed Brokerage Account, Common Stock Participant-directed investments — at contract value (Note 5) Fully benefit responsive investment contracts, at contract value EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value Matching percentage EBP, Employer Contribution, Matching Percentage EBP, Employee Eligibility Status [Domain] EBP, Employee Eligibility Status [Domain] EBP, Employee Eligibility Status [Domain] Net assets available for benefits per Form 5500 EBP, Form 5500 Caption, Net Assets EBP, Plan Contribution Component [Domain] EBP, Plan Contribution Component [Domain] EBP, Plan Contribution Component [Domain] Maximum automatic deferral rate, percentage EBP, Participant Contribution, Automatic, Deferral Rate Maximum Percentage EBP, Participant Contribution, Automatic, Deferral Rate Maximum Percentage EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]