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LEASES - Narratives (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) aircraft
Lessee, Lease, Description [Line Items] |
Number of lease aircrafts (aircraft) | 314
Number of lease aircrafts, finance (aircraft) | 24
Number of lease aircrafts, operating (aircraft) | 17
Number of lease aircrafts, short-term (aircraft) | 273
Lessee, Finance Lease and Operating Lease, Lease Not Yet Commenced, Amount | $ | $ 178
Minimum |
Lessee, Lease, Description [Line Items] |
Remaining lease term | 1 month
Maximum |
Lessee, Lease, Description [Line Items] |
Remaining lease term | 139 years

X
- Definition Lessee, Finance Lease and Operating Lease, Lease Not Yet Commenced, Amount + References No definition available. + Details
Name: | ups_LesseeFinanceLeaseAndOperatingLeaseLeaseNotYetCommencedAmount
Namespace Prefix: | ups_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee Lease Term + References No definition available. + Details
Name: | ups_LesseeLeaseTerm
Namespace Prefix: | ups_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Leased Aircrafts + References No definition available. + Details
Name: | ups_NumberofLeasedAircrafts
Namespace Prefix: | ups_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Leased Aircrafts, Finance Lease + References No definition available. + Details
Name: | ups_NumberofLeasedAircraftsFinanceLease
Namespace Prefix: | ups_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Leased Aircrafts, Operating Lease + References No definition available. + Details
Name: | ups_NumberofLeasedAircraftsOperatingLease
Namespace Prefix: | ups_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Leased Aircrafts, Short-term + References No definition available. + Details
Name: | ups_NumberofLeasedAircraftsShortterm
Namespace Prefix: | ups_
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_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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