Annual report pursuant to Section 13 and 15(d)

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

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MULTIEMPLOYER EMPLOYEE BENEFIT PLANS - UPS's Participation in Multiemployer Plans (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Employees
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2012
Employees
Multiemployer Plans [Line Items]        
Number of employees under a national master agreement and various supplemental agreements with local unions affiliated with Teamster | Employees 290,000      
Employees Not Employed Under Agreement With Teamsters | Employees 3,300      
Number of pilots under a collective bargaining agreement with the Independent Pilots Association | Employees 2,900      
Ground Mechanics Employed Under IAM Agreements | Employees 1,500      
Represented by Teamsters [Member]        
Multiemployer Plans [Line Items]        
Number of employees under a national master agreement and various supplemental agreements with local unions affiliated with Teamster | Employees       10,200
Multiemployer Plans, Pension        
Multiemployer Plans [Line Items]        
Multiemployer Plans, Period Contributions, Significance of Contributions 5.00%      
Multiemployer pension plans, maximum term to forecast a funding deficiency in the orange zone 6 years      
UPS Contribution $ 2,220 $ 2,042 $ 1,870  
Multi-employer plans, fair value of withdrawal liability $ 929 $ 832    
Debt Instrument, Term 43 years      
Multiemployer Plans, Pension | 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 No      
UPS Contribution $ 48 $ 44 40  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 Contribution $ 14 $ 13 12  
Surcharge Imposed No      
Multiemployer Plans, Pension | Hagerstown Motor Carriers and Teamsters Pension Fund        
Multiemployer Plans [Line Items]        
EIN / Pension Plan Number 52-6045424-001      
Pension Protection Act Zone Status Red Red    
FIP/RP Status Pending/ Implemented Implemented      
UPS Contribution $ 10 $ 9 8  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 Green Green    
FIP/RP Status Pending/ Implemented No      
UPS Contribution $ 41 $ 38 35  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 No      
UPS Contribution $ 142 $ 129 118  
Surcharge Imposed No      
Multiemployer Plans, Pension | Local 705, International Brotherhood of Teamsters Pension Plan        
Multiemployer Plans [Line Items]        
EIN / Pension Plan Number 36-6492502-001      
Pension Protection Act Zone Status Yellow Yellow    
FIP/RP Status Pending/ Implemented Implemented      
UPS Contribution $ 113 $ 104 93  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 Yellow Yellow    
FIP/RP Status Pending/ Implemented Implemented      
UPS Contribution $ 112 $ 116 110  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 No      
UPS Contribution $ 48 $ 42 38  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 Contribution $ 120 $ 121 114  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 Contribution $ 119 $ 108 100  
Surcharge Imposed No      
Multiemployer Plans, Pension | Teamster Pension Fund of Philadelphia and Vicinity        
Multiemployer Plans [Line Items]        
EIN / Pension Plan Number 23-1511735-001      
Pension Protection Act Zone Status Yellow Yellow    
FIP/RP Status Pending/ Implemented Implemented      
UPS Contribution $ 74 $ 66 60  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 No      
UPS Contribution $ 75 $ 69 64  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 No      
UPS Contribution $ 68 $ 61 55  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 No      
UPS Contribution $ 37 $ 34 32  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 No      
UPS Contribution $ 24 $ 22 20  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 Red Red    
FIP/RP Status Pending/ Implemented Implemented      
UPS Contribution $ 100 $ 95 88  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 No      
UPS Contribution $ 939 $ 868 772  
Surcharge Imposed No      
Multiemployer Plans, Pension | 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 Contribution $ 34 $ 31 30  
Surcharge Imposed No      
Multiemployer Plans, Pension | All Other Multiemployer Pension Plans        
Multiemployer Plans [Line Items]        
UPS Contribution $ 102 $ 72 $ 81  
Multiemployer Plans, Pension | Minimum        
Multiemployer Plans [Line Items]        
Multiemployer pension plans, percentage of plan funded   0.00%  
Multiemployer Plans, Pension | Green Zone, At Least 80% Funded [Member] | Minimum        
Multiemployer Plans [Line Items]        
Multiemployer pension plans, percentage of plan funded 80.00%      
Multiemployer Plans, Pension | Red Zone, Less than 65% Funded [Member] | Maximum        
Multiemployer Plans [Line Items]        
Multiemployer pension plans, percentage of plan funded 65.00%      
Multiemployer Plans, Pension | Otange Zone, Less than 80% and Have an Accumulated Funding Deficiency or Expect to Have a Deficiency Within Six Years [Member]        
Multiemployer Plans [Line Items]        
Multiemployer pension plans, percentage of plan funded 80.00%      
Multiemployer Plans, Pension | Yellow Zone, Less than 80% Funded [Member] | Maximum        
Multiemployer Plans [Line Items]        
Multiemployer pension plans, percentage of plan funded 80.00%      
Other Noncurrent Liabilities [Member] | Multiemployer Plans, Pension        
Multiemployer Plans [Line Items]        
Multiemployer plans, present value of withdrawal liability $ 845 $ 852    
Other current liabilities | Multiemployer Plans, Pension        
Multiemployer Plans [Line Items]        
Multiemployer plans, present value of withdrawal liability $ 7 $ 7