| 
           MULTIEMPLOYER EMPLOYEE BENEFIT PLANS - UPS's Participation in Multiemployer Plans (Detail) (USD $) In Millions, unless otherwise specified 
         | 
        9 Months Ended | 
        12 Months Ended | 
      
      
        | 
           Sep. 30, 2012
 
          Group 
         | 
        
           Dec. 31, 2012 
         | 
        
           Dec. 31, 2011 
         | 
        
           Dec. 31, 2010 
         | 
      
      
        | 
           Multiemployer Plans, Pension 
         | 
         
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Multiemployer Plans [Line Items] | 
         
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Multiemployer pension plans, maximum term to forecast a funding deficiency in the orange zone | 
         
 | 
        6 years
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        $ 1,325
 | 
        $ 1,243
 | 
        $ 1,186
 | 
      
      
        | Multiemployer plans, number of beneficiary groups | 
        2
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Multiemployer plans, withdrawal liability | 
        2,162
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Multiemployer Plans, period to repay withdrawal liability | 
        50 years
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Multiemployer plans, present value of withdrawal liability | 
        896
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Discount rate | 
        4.25%
 | 
         
 | 
         
 | 
         
 | 
      
      
        | 
           Multiemployer Plans, Pension | 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 Contribution | 
         
 | 
        4
 | 
        4
 | 
        3
 | 
      
      
        | Surcharge Imposed | 
         
 | 
        No
 | 
         
 | 
         
 | 
      
      
        | 
           Multiemployer Plans, Pension | Automotive Industries Pension Plan 
         | 
         
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Multiemployer Plans [Line Items] | 
         
 | 
         
 | 
         
 | 
         
 | 
      
      
        | EIN / Pension Plan Number | 
         
 | 
        94-1133245-001
 | 
         
 | 
         
 | 
      
      
        | Pension Protection Act Zone Status | 
         
 | 
        Red
 | 
        Red
 | 
         
 | 
      
      
        | FIP/RP Status Pending/ Implemented | 
         
 | 
        Implemented
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        4
 | 
        4
 | 
        4
 | 
      
      
        | Surcharge Imposed | 
         
 | 
        No
 | 
         
 | 
         
 | 
      
      
        | 
           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 | 
         
 | 
        Yellow
 | 
        Green
 | 
         
 | 
      
      
        | FIP/RP Status Pending/ Implemented | 
         
 | 
        Implemented
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        29
 | 
        27
 | 
        26
 | 
      
      
        | 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 | 
         
 | 
        Green
 | 
        Green
 | 
         
 | 
      
      
        | FIP/RP Status Pending/ Implemented | 
         
 | 
        No
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        9
 | 
        8
 | 
        8
 | 
      
      
        | 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 | 
         
 | 
        5
 | 
        5
 | 
        4
 | 
      
      
        | 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 | 
         
 | 
        24
 | 
        25
 | 
        24
 | 
      
      
        | 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
 | 
        Yellow
 | 
         
 | 
      
      
        | FIP/RP Status Pending/ Implemented | 
         
 | 
        No
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        75
 | 
        74
 | 
        70
 | 
      
      
        | 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 | 
         
 | 
        Red
 | 
        Yellow
 | 
         
 | 
      
      
        | FIP/RP Status Pending/ Implemented | 
         
 | 
        Implemented
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        46
 | 
        58
 | 
        56
 | 
      
      
        | 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 | 
         
 | 
        Red
 | 
        Red
 | 
         
 | 
      
      
        | FIP/RP Status Pending/ Implemented | 
         
 | 
        Implemented
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        87
 | 
        84
 | 
        84
 | 
      
      
        | 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 | 
         
 | 
        26
 | 
        26
 | 
        24
 | 
      
      
        | 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 | 
         
 | 
        124
 | 
        124
 | 
        112
 | 
      
      
        | 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 | 
         
 | 
        65
 | 
        57
 | 
        52
 | 
      
      
        | 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 | 
         
 | 
        44
 | 
        41
 | 
        39
 | 
      
      
        | 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 | 
         
 | 
        Yellow
 | 
        Yellow
 | 
         
 | 
      
      
        | FIP/RP Status Pending/ Implemented | 
         
 | 
        Implemented
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        44
 | 
        41
 | 
        38
 | 
      
      
        | 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 | 
         
 | 
        Implemented
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        36
 | 
        33
 | 
        31
 | 
      
      
        | 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 | 
         
 | 
        Red
 | 
        Red
 | 
         
 | 
      
      
        | FIP/RP Status Pending/ Implemented | 
         
 | 
        Implemented
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        24
 | 
        22
 | 
        20
 | 
      
      
        | 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 | 
         
 | 
        Yellow
 | 
        Yellow
 | 
         
 | 
      
      
        | FIP/RP Status Pending/ Implemented | 
         
 | 
        Implemented
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        14
 | 
        12
 | 
        12
 | 
      
      
        | 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 | 
         
 | 
        62
 | 
        57
 | 
        59
 | 
      
      
        | 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 | 
         
 | 
        520
 | 
        476
 | 
        449
 | 
      
      
        | 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 | 
         
 | 
        24
 | 
        21
 | 
        20
 | 
      
      
        | Surcharge Imposed | 
         
 | 
        No
 | 
         
 | 
         
 | 
      
      
        | 
           Multiemployer Plans, Pension | All Other Multiemployer Pension Plans 
         | 
         
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Multiemployer Plans [Line Items] | 
         
 | 
         
 | 
         
 | 
         
 | 
      
      
        | UPS Contribution | 
         
 | 
        $ 59
 | 
        $ 44
 | 
        $ 51
 | 
      
      
        | 
           Multiemployer Plans, Pension | Minimum 
         | 
         
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Multiemployer Plans [Line Items] | 
         
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Multiemployer pension plans, percentage of plan funded | 
         
 | 
        5.00%
 | 
        5.00%
 | 
        5.00%
 | 
      
      
        | 
           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%
 | 
         
 | 
         
 | 
      
      
        | 
           Represented by Teamsters [Member] 
         | 
         
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Multiemployer Plans [Line Items] | 
         
 | 
         
 | 
         
 | 
         
 | 
      
      
        | Number of employees | 
        10,200
 | 
         
 | 
         
 | 
         
 |