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Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2023	Aug. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 21,681	$ 23,242
Operating income (loss)	1,485	1,191
Operating Segments [Member] | FedEx Express Segment [Member]
Segment Reporting Information [Line Items]
Revenue	10,085	11,127
Operating income (loss)	205	174
Operating Segments [Member] | FedEx Ground Segment [Member]
Segment Reporting Information [Line Items]
Revenue	8,420	8,160
Operating income (loss)	1,103	694
Operating Segments [Member] | FedEx Freight Segment [Member]
Segment Reporting Information [Line Items]
Revenue	2,291	2,723
Operating income (loss)	481	651
Operating Segments [Member] | FedEx Services Segment [Member]
Segment Reporting Information [Line Items]
Revenue	72	70
Corporate, Other and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	813	1,162
Operating income (loss)	$ (304)	$ (328)

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