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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	May 31, 2025	May 31, 2024	May 31, 2023	May 31, 2025	May 31, 2024	May 31, 2023
Goodwill [Line Items]
Goodwill impairment charges				$ 0	$ 0
Asset impairment charges	$ 0	$ 0		21	157	$ 117
Intangible assets amortization expense				$ 48	$ 47	52
ShopRunner Acquisition
Goodwill [Line Items]
Asset impairment charges			$ 11
FedEx Dataworks, Inc.
Goodwill [Line Items]
Goodwill impairment charges						$ 36
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]						Asset impairment charges

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