Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2024	Aug. 31, 2023	May 31, 2024
Segment Reporting Information [Line Items]
Revenues	$ 21,579	$ 21,681
Operating income (loss)	1,080	1,485
Assets	86,711		$ 87,007
Operating Segments [Member] | Federal Express Segment [Member]
Segment Reporting Information [Line Items]
Revenues	18,305	18,426
Operating income (loss)	953	1,306
Assets	73,207		73,259
Operating Segments [Member] | FedEx Freight Segment [Member]
Segment Reporting Information [Line Items]
Revenues	2,329	2,385
Operating income (loss)	439	482
Assets	11,815		11,615
Corporate, Other and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	945	870
Operating income (loss)	(312)	$ (303)
Assets	$ 1,689		$ 2,133