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Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 20,563	$ 17,324	$ 39,884	$ 34,372
Operating income (loss)	1,465	554	3,055	1,531
Operating Segments [Member] | FedEx Express Segment [Member]
Segment Reporting Information [Line Items]
Revenue	10,368	9,084	20,015	18,029
Operating income (loss)	900	236	1,610	521
Operating Segments [Member] | FedEx Ground Segment [Member]
Segment Reporting Information [Line Items]
Revenue	7,344	5,315	14,384	10,494
Operating income (loss)	552	342	1,386	986
Operating Segments [Member] | FedEx Freight Segment [Member]
Segment Reporting Information [Line Items]
Revenue	1,936	1,844	3,762	3,749
Operating income (loss)	252	141	526	335
Operating Segments [Member] | FedEx Services Segment [Member]
Segment Reporting Information [Line Items]
Revenue	8	5	16	9
Corporate, Other and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	907	1,076	1,707	2,091
Operating income (loss)	$ (239)	$ (165)	$ (467)	$ (311)

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