Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2024	May 31, 2023	May 31, 2022
Net Goodwill Detail [Abstract]
Gross Goodwill at May 31				$ 8,586
Accumulated impairment charges		$ (2,078)		(2,042)
Goodwill		6,423	$ 6,435	6,544
Goodwill Roll Forward
Beginning Goodwill at May 31		6,435	6,544
Impairment charges			(36)
Other	[1]	(12)	(73)
Ending Goodwill at May 31		6,423	6,435
Accumulated impairment charges		(2,078)		(2,042)
Corporate, Other and Eliminations [Member]
Net Goodwill Detail [Abstract]
Gross Goodwill at May 31				1,962
Accumulated impairment charges		(1,945)		(1,909)
Goodwill		16	16	53
Goodwill Roll Forward
Beginning Goodwill at May 31		16	53
Impairment charges			(36)
Other	[1]	(0)	(1)
Ending Goodwill at May 31		16	16
Accumulated impairment charges		(1,945)		(1,909)
FedEx Express Segment [Member] | Operating Segments [Member]
Net Goodwill Detail [Abstract]
Gross Goodwill at May 31				4,925
Goodwill		4,841	4,853	4,925
Goodwill Roll Forward
Beginning Goodwill at May 31		4,853	4,925
Other	[1]	(12)	(72)
Ending Goodwill at May 31		4,841	4,853
FedEx Ground Segment [Member] | Operating Segments [Member]
Net Goodwill Detail [Abstract]
Gross Goodwill at May 31				932
Goodwill		932	932	932
Goodwill Roll Forward
Beginning Goodwill at May 31		932	932
Other	[1]	(0)
Ending Goodwill at May 31		932	932
FedEx Freight Segment [Member] | Operating Segments [Member]
Net Goodwill Detail [Abstract]
Gross Goodwill at May 31				767
Accumulated impairment charges		(133)		(133)
Goodwill		634	634	634
Goodwill Roll Forward
Beginning Goodwill at May 31		634	634
Ending Goodwill at May 31		634	$ 634
Accumulated impairment charges		$ (133)		$ (133)

[1] Primarily currency translation adjustments.