Business Segment Information (Details 2) $ in Millions	3 Months Ended	12 Months Ended
	May. 31, 2015 USD ($)	May. 31, 2015 USD ($)	May. 31, 2014 USD ($)	May. 31, 2013 USD ($)
Business Segment Information Table Detail [Line Items]
Business Realignment Costs				$ 560
Asset Impairment Charges	$ 276
Ground legal reserve	197
Mark to Market pension accounting	$ 2,200
FedEx Express Segment [Member]
Business Segment Information Table Detail [Line Items]
Business Realignment Costs			$ 405
Asset Impairment Charges		$ 276	$ 100
Number Of Impaired Aircraft			10
FedEx Ground Segment [Member]
Business Segment Information Table Detail [Line Items]
Business Realignment Costs				105
Ground legal reserve		197
FedEx Freight Segment [Member]
Business Segment Information Table Detail [Line Items]
Business Realignment Costs				50
Corporate, eliminations and other [Member]
Business Segment Information Table Detail [Line Items]
Mark to Market pension accounting		$ 2,200	$ 15	$ (1,400)