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PROPERTY, PLANT AND EQUIPMENT - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, plant and equipment purchased on account	$ 454	$ 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