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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266

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, 2020	May 31, 2019	May 31, 2018
Goodwill [Line Items]
Goodwill impairment charges		$ 358
Intangible assets amortization expense		66	$ 82	$ 87
Corporate, Other and Eliminations [Member]
Goodwill [Line Items]
Goodwill impairment charges		358	$ 0
Corporate, Other and Eliminations [Member] \| Associated with FedEx Supply Chain [Member]
Goodwill [Line Items]
Goodwill impairment charges				$ 374
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