Business Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 14,663	$ 12,279
Operating Income	1,264	1,144
FedEx Express Segment [Member]
Segment Reporting Information [Line Items]
Revenues	6,656	6,591
Operating Income	624	545
TNT Express Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,804
Operating Income	(14)
FedEx Ground Segment [Member]
Segment Reporting Information [Line Items]
Revenues	4,290	3,830
Operating Income	610	537
FedEx Freight Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,658	1,601
Operating Income	135	132
FedEx Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues	395	390
Eliminations, corporate and other
Segment Reporting Information [Line Items]
Revenues	(140)	(133)
Operating Income	$ (91)	$ (70)