Annual report pursuant to Section 13 and 15(d)

MULTIEMPLOYER EMPLOYEE BENEFIT PLANS - UPS's Participation in Multiemployer Plans (Details)

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MULTIEMPLOYER EMPLOYEE BENEFIT PLANS - UPS's Participation in Multiemployer Plans (Details) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals $ 2,953 $ 2,941 $ 2,787
Alaska Teamster-Employer Pension Plan      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 92-6003463-024    
Pension Protection Act Zone Status Red Red  
FIP / RP Status Pending / Implemented Implemented    
UPS Contributions and Accruals $ 10 $ 10 9
Surcharge Imposed No    
Central Pennsylvania Teamsters Defined Benefit Plan      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 23-6262789-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 82 $ 75 65
Surcharge Imposed No    
Eastern Shore Teamsters Pension Fund      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 52-0904953-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 10 $ 10 8
Surcharge Imposed No    
Employer-Teamsters Local Nos. 175 & 505 Pension Trust Fund      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 55-6021850-001    
Pension Protection Act Zone Status Red Red  
FIP / RP Status Pending / Implemented Implemented    
UPS Contributions and Accruals $ 21 $ 21 18
Surcharge Imposed No    
Hagerstown Motor Carriers and Teamsters Pension Fund      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 52-6045424-001    
Pension Protection Act Zone Status Green Red  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 13 $ 13 12
Surcharge Imposed No    
I.A.M. National Pension Fund / National Pension Plan      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 51-6031295-002    
Pension Protection Act Zone Status Red Red  
FIP / RP Status Pending / Implemented Implemented    
UPS Contributions and Accruals $ 50 $ 48 48
Surcharge Imposed No    
International Brotherhood of Teamsters Union Local No. 710 Pension Fund      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 36-2377656-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 196 $ 191 180
Surcharge Imposed No    
Local 705, International Brotherhood of Teamsters Pension Plan      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 36-6492502-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 138 $ 136 131
Surcharge Imposed No    
Local 804 I.B.T. & Local 447 I.A.M.—UPS Multiemployer Retirement Plan      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 51-6117726-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 143 $ 144 135
Surcharge Imposed No    
Milwaukee Drivers Pension Trust Fund      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 39-6045229-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 62 $ 62 58
Surcharge Imposed No    
New England Teamsters & Trucking Industry Pension Fund      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 04-6372430-001    
Pension Protection Act Zone Status Red Red  
FIP / RP Status Pending / Implemented Implemented    
UPS Contributions and Accruals $ 234 $ 167 145
Surcharge Imposed No    
New York State Teamsters Conference Pension and Retirement Fund      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 16-6063585-074    
Pension Protection Act Zone Status Red Red  
FIP / RP Status Pending / Implemented Implemented    
UPS Contributions and Accruals $ 139 $ 149 147
Surcharge Imposed No    
Teamster Pension Fund of Philadelphia and Vicinity      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 23-1511735-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 98 $ 100 94
Surcharge Imposed No    
Teamsters Joint Council No. 83 of Virginia Pension Fund      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 54-6097996-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 98 $ 98 89
Surcharge Imposed No    
Teamsters Local 639—Employers Pension Trust      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 53-0237142-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 84 $ 85 80
Surcharge Imposed No    
Teamsters Negotiated Pension Plan      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 43-6196083-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 49 $ 49 45
Surcharge Imposed No    
Truck Drivers and Helpers Local Union No. 355 Retirement Pension Plan      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 52-6043608-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 28 $ 30 29
Surcharge Imposed No    
United Parcel Service, Inc.—Local 177, I.B.T. Multiemployer Retirement Plan      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 13-1426500-419    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 122 $ 124 116
Surcharge Imposed No    
Western Conference of Teamsters Pension Plan      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 91-6145047-001    
Pension Protection Act Zone Status Green Green  
FIP / RP Status Pending / Implemented NA    
UPS Contributions and Accruals $ 1,254 $ 1,310 1,260
Surcharge Imposed No    
Western Pennsylvania Teamsters and Employers Pension Fund      
Multiemployer Plans [Line Items]      
EIN / Pension Plan Number 25-6029946-001    
Pension Protection Act Zone Status Red Red  
FIP / RP Status Pending / Implemented Implemented    
UPS Contributions and Accruals $ 46 $ 46 40
Surcharge Imposed No    
All Other Multiemployer Pension Plans      
Multiemployer Plans [Line Items]      
UPS Contributions and Accruals $ 76 $ 73 $ 78