Business Segment Information (Details) (USD $) In Millions	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Segment Reporting Information [Line Items]
Revenues	$ 10,521	$ 9,457
Operating Income (Loss)	737	628
FedEx Express Segment [Member]
Segment Reporting Information [Line Items]
Revenues	6,592	5,912
Operating Income (Loss)	288	357
FedEx Ground Segment [Member]
Segment Reporting Information [Line Items]
Revenues	2,278	1,961
Operating Income (Loss)	407	287
FedEx Freight Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,328	1,258
Operating Income (Loss)	42	(16)
FedEx Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues	411	415
Other and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ (88)	$ (89)