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Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Segment Reporting Information [Line Items]
Revenue	$ 21,510	$ 17,487	$ 61,394	$ 51,859
Operating income (loss)	1,005	411	4,060	1,942
Operating Segments [Member] | FedEx Express Segment [Member]
Segment Reporting Information [Line Items]
Revenue	10,788	8,924	30,803	26,953
Operating income (loss)	463	137	2,073	658
Operating Segments [Member] | FedEx Ground Segment [Member]
Segment Reporting Information [Line Items]
Revenue	7,980	5,845	22,364	16,339
Operating income (loss)	702	355	2,088	1,341
Operating Segments [Member] | FedEx Freight Segment [Member]
Segment Reporting Information [Line Items]
Revenue	1,836	1,738	5,598	5,487
Operating income (loss)	119	113	645	448
Operating Segments [Member] | FedEx Services Segment [Member]
Segment Reporting Information [Line Items]
Revenue	8	6	24	15
Corporate, Other and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	898	974	2,605	3,065
Operating income (loss)	$ (279)	$ (194)	$ (746)	$ (505)

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