Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	May 31, 2020	May 31, 2021	May 31, 2020	May 31, 2019
Goodwill [Line Items]
Goodwill impairment charges		$ 0	$ 358	$ 0
Intangible assets amortization expense		$ 49	66	$ 82
Corporate, Other and Eliminations [Member]
Goodwill [Line Items]
Goodwill impairment charges			358
Corporate, Other and Eliminations [Member] \| Associated with FedEx Office [Member]
Goodwill [Line Items]
Goodwill impairment charges	$ 348
Corporate, Other and Eliminations [Member] \| Associated with FedEx Office And Print Services [Member]
Goodwill [Line Items]
Goodwill impairment charges			$ 358