MULTIEMPLOYER EMPLOYEE BENEFIT PLANS - UPS's Participation in Multiemployer Plans (Detail)  $ in Millions  | 
12 Months Ended | 
 | 
| 
 Dec. 31, 2021  
USD ($)  
employee 
 | 
 Dec. 31, 2020  
USD ($) 
 | 
 Dec. 31, 2019  
USD ($) 
 | 
 Sep. 30, 2012  
employee 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| Number of employees under a national master agreement and various supplemental agreements with local unions affiliated with Teamster | employee | 
327,000
 | 
 
 | 
 
 | 
 
 | 
| Number of pilots under a collective bargaining agreement with the Independent Pilots Association | employee | 
3,200
 | 
 
 | 
 
 | 
 
 | 
| Employees Not Employed Under Agreement With Teamsters | employee | 
3,300
 | 
 
 | 
 
 | 
 
 | 
| Ground Mechanics Employed Under IAM Agreements | employee | 
1,700
 | 
 
 | 
 
 | 
 
 | 
| 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 | employee | 
 
 | 
 
 | 
 
 | 
10,200
 | 
| Pension Benefits | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans, Period Contributions, Significance of Contributions | 
5.00%
 | 
5.00%
 | 
5.00%
 | 
 
 | 
| Multiemployer pension plans, maximum term to forecast a funding deficiency in the orange zone | 
6 years
 | 
 
 | 
 
 | 
 
 | 
| Multi-employer plans, fair value of withdrawal liability | 
$ 963
 | 
$ 1,000
 | 
 
 | 
 
 | 
| Debt instrument, term | 
41 years
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 2,787
 | 
$ 2,555
 | 
$ 2,220
 | 
 
 | 
| Pension Benefits | Central Pennsylvania Teamsters Defined Benefit Plan | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
23-6262789-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Green
 | 
Green
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 65
 | 
$ 57
 | 
48
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
NA
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Employer-Teamsters Local Nos. 175 & 505 Pension Trust Fund | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
55-6021850-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Red
 | 
Red
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 18
 | 
$ 16
 | 
14
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
Implemented
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Hagerstown Motor Carriers and Teamsters Pension Fund | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
52-6045424-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Red
 | 
Red
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 12
 | 
$ 11
 | 
10
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
Implemented
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | I.A.M. National Pension Fund / National Pension Plan | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
51-6031295-002
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Red
 | 
Red
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 48
 | 
$ 44
 | 
41
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
Implemented
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | International Brotherhood of Teamsters Union Local No. 710 Pension Fund | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
36-2377656-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Green
 | 
Green
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 180
 | 
$ 161
 | 
142
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
NA
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Local 705, International Brotherhood of Teamsters Pension Plan | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
36-6492502-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Yellow
 | 
Yellow
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 131
 | 
$ 120
 | 
113
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
Implemented
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | 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
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Green
 | 
Yellow
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 135
 | 
$ 124
 | 
112
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
NA
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Milwaukee Drivers Pension Trust Fund | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
39-6045229-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Green
 | 
Green
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 58
 | 
$ 53
 | 
48
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
NA
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | New England Teamsters & Trucking Industry Pension Fund | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
04-6372430-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Red
 | 
Red
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 145
 | 
$ 140
 | 
120
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
Implemented
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | New York State Teamsters Conference Pension and Retirement Fund | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
16-6063585-074
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Red
 | 
Red
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 147
 | 
$ 135
 | 
119
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
Implemented
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Teamster Pension Fund of Philadelphia and Vicinity | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
23-1511735-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Yellow
 | 
Yellow
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 94
 | 
$ 85
 | 
74
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
Implemented
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Teamsters Joint Council No. 83 of Virginia Pension Fund | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
54-6097996-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Green
 | 
Green
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 89
 | 
$ 82
 | 
75
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
NA
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Teamsters Local 639—Employers Pension Trust | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
53-0237142-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Green
 | 
Green
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 80
 | 
$ 74
 | 
68
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
NA
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Teamsters Negotiated Pension Plan | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
43-6196083-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Green
 | 
Green
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 45
 | 
$ 40
 | 
37
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
NA
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Truck Drivers and Helpers Local Union No. 355 Retirement Pension Plan | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
52-6043608-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Green
 | 
Green
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 29
 | 
$ 27
 | 
24
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
NA
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | United Parcel Service, Inc.—Local 177, I.B.T. Multiemployer Retirement Plan | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
13-1426500-419
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Yellow
 | 
Red
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 116
 | 
$ 107
 | 
100
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
Implemented
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Western Conference of Teamsters Pension Plan | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
91-6145047-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Green
 | 
Green
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 1,260
 | 
$ 1,138
 | 
939
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
NA
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Western Pennsylvania Teamsters and Employers Pension Fund | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| EIN / Pension Plan Number | 
25-6029946-001
 | 
 
 | 
 
 | 
 
 | 
| Surcharge Imposed | 
No
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List] | 
Red
 | 
Red
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 40
 | 
$ 37
 | 
34
 | 
 
 | 
| Multiemployer Plan, Pension, Insignificant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List] | 
Implemented
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | All Other Multiemployer Pension Plans | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plan, Employer Contribution, Cost | 
$ 95
 | 
104
 | 
$ 102
 | 
 
 | 
| Pension Benefits | Green Zone, At Least 80% Funded [Member] | Minimum | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer pension plans, percentage of plan funded | 
80.00%
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Red Zone, Less than 65% Funded [Member] | Maximum | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer pension plans, percentage of plan funded | 
65.00%
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | 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%
 | 
 
 | 
 
 | 
 
 | 
| Pension Benefits | Yellow Zone, Less than 80% Funded [Member] | Maximum | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer pension plans, percentage of plan funded | 
80.00%
 | 
 
 | 
 
 | 
 
 | 
| Other non-current liabilities | Pension Benefits | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer plans, present value of withdrawal liability | 
$ 830
 | 
837
 | 
 
 | 
 
 | 
| Other current liabilities | Pension Benefits | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer Plans [Line Items] | 
 
 | 
 
 | 
 
 | 
 
 | 
| Multiemployer plans, present value of withdrawal liability | 
$ 8
 | 
$ 7
 | 
 
 | 
 
 |