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, 2023
Dec. 31, 2022
Dec. 31, 2021
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals $ 6,268 $ 6,033 $ 5,813
Bay Area Delivery Drivers      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 40 40 41
Central Pennsylvania Teamsters Health & Pension Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 46 42 39
Central States, South East & South West Areas Health and Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 3,712 3,497 3,374
Delta Health Systems—East Bay Drayage Drivers      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 39 39 39
Joint Council #83 Health & Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 63 62 56
Local 401 Teamsters Health & Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 23 22 19
Local 804 Welfare Trust Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 131 129 123
Milwaukee Drivers Pension Trust Fund—Milwaukee Drivers Health and Welfare Trust Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 64 62 59
New York State Teamsters Health & Hospital Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 87 89 91
Northern California General Teamsters (DELTA)      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 206 211 209
Northern New England Benefit Trust      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 83 87 81
Oregon / Teamster Employers Trust      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 69 70 66
Teamsters 170 Health & Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 21 25 24
Teamsters Benefit Trust      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 57 58 60
Teamsters Local 175 & 505 Health and Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 20 20 17
Teamsters Local 191 Health Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 29 17 17
Teamsters Local 251 Health & Insurance Plan      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 22 26 26
Teamsters Local 638 Health Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 73 70 66
Teamsters Local 639—Employers Health & Pension Trust Funds      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 36 38 40
Teamsters Local 671 Health Services & Insurance Plan      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 24 25 24
Teamsters Union 25 Health Services & Insurance Plan      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 73 75 74
Teamsters Western Region & Local 177 Health Care Plan      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 1,076 1,035 980
Truck Drivers and Helpers Local 355 Baltimore Area Health & Welfare Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 23 23 23
Utah-Idaho Teamsters Security Fund      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 54 54 52
Washington Teamsters Welfare Trust      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals 88 88 83
All Other Multiemployer Health and Welfare Plans      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals $ 109 $ 129 $ 130