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LEASES - Narratives (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 aircraft | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Number of lease aircrafts (aircraft) | 342 |  |
Number of lease aircrafts, finance (aircraft) | 31 |  |
Number of lease aircrafts, operating (aircraft) | 14 |  |
Number of lease aircrafts, short-term (aircraft) | 297 |  |
Rent expense related to operating leases | $ |  | $ 959 | $ 804
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Lease Term | 1 month |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Lease Term | 190 years |  |

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- Definition Lessee, Lease Term + References No definition available. + Details
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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

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

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |