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v3.21.1

SEGMENT INFORMATION - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2021 Countries_and_Territories Segments
Segment Reporting Information [Line Items] |
Operating Segments, Number | Segments | 3
International Package | Minimum |
Segment Reporting Information [Line Items] |
Number of countries and territories in which service is rendered | 220
Supply Chain & Freight | Minimum |
Segment Reporting Information [Line Items] |
Number of countries and territories in which service is rendered | 200

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- Definition Operating Segments, Number + References No definition available. + Details
Name: | ups_OperatingSegmentsNumber
Namespace Prefix: | ups_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ups_InternationalPackageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ups_SupplyChainFreightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |