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PROPERTY, PLANT AND EQUIPMENT - Additional Information (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Property, Plant and Equipment [Abstract] |  |
Property, plant and equipment purchased on account | $ 381 | $ 319

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- Definition Property, Plant, and Equipment Purchased on Account + References No definition available. + Details
Name: | ups_PropertyPlantAndEquipmentPurchasedOnAccount
Namespace Prefix: | ups_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration