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Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2025	Feb. 29, 2024	May 31, 2024
Segment Reporting Information [Line Items]
Revenues	$ 22,160	$ 21,738	$ 65,706	$ 65,584
Operating income (loss)	1,292	1,243	3,424	4,004
Assets	85,043		85,043		$ 87,007
Operating Segments [Member] | Federal Express Segment [Member]
Segment Reporting Information [Line Items]
Revenues	19,181	18,672	56,327	55,871
Operating income (loss)	1,294	1,173	3,299	3,514
Assets	72,252		72,252		73,259
Operating Segments [Member] | FedEx Freight Segment [Member]
Segment Reporting Information [Line Items]
Revenues	2,089	2,205	6,595	7,042
Operating income (loss)	261	341	1,012	1,314
Assets	12,479		12,479		11,615
Corporate, Other and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	890	861	2,784	2,671
Operating income (loss)	(263)	$ (271)	(887)	$ (824)
Assets	$ 312		$ 312		$ 2,133

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