Annual report pursuant to Section 13 and 15(d)

MULTIEMPLOYER EMPLOYEE BENEFIT PLANS - Multi-Employer Health and Welfare Plans (Details)

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MULTIEMPLOYER EMPLOYEE BENEFIT PLANS - Multi-Employer Health and Welfare Plans (Details) - Health and Welfare Fund - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals $ 6,431 $ 6,268 $ 6,033
Bay Area Delivery Drivers      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 41 40 40
Central Pennsylvania Teamsters Health & Pension Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 48 46 42
Central States, South East & South West Areas Health and Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 3,849 3,712 3,497
Delta Health Systems—East Bay Drayage Drivers      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 37 39 39
Joint Council #83 Health & Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 63 63 62
Local 401 Teamsters Health & Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 24 23 22
Local 804 Welfare Trust Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 131 131 129
Milwaukee Drivers Pension Trust Fund—Milwaukee Drivers Health and Welfare Trust Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 64 64 62
New York State Teamsters Health & Hospital Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 89 87 89
Northern California General Teamsters (DELTA)      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 202 206 211
Northern New England Benefit Trust      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 82 83 87
Oregon / Teamster Employers Trust      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 68 69 70
Teamsters 170 Health & Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 22 21 25
Teamsters Benefit Trust      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 59 57 58
Teamsters Local 175 & 505 Health and Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 20 20 20
Teamsters Local 191 Health Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 30 29 17
Teamsters Local 251 Health & Insurance Plan      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 22 22 26
Teamsters Local 638 Health Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 74 73 70
Teamsters Local 639—Employers Health & Pension Trust Funds      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 35 36 38
Teamsters Local 671 Health Services & Insurance Plan      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 24 24 25
Teamsters Union 25 Health Services & Insurance Plan      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 73 73 75
Teamsters Western Region & Local 177 Health Care Plan      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 1,109 1,076 1,035
Truck Drivers and Helpers Local 355 Baltimore Area Health & Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 21 23 23
Utah-Idaho Teamsters Security Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 53 54 54
Washington Teamsters Welfare Trust      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 83 88 88
All Other Multiemployer Health and Welfare Plans      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals $ 108 $ 109 $ 129