Business Segment Information (Details 4) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May. 31, 2015	May. 31, 2014	May. 31, 2013
Revenues From External Customers And Long Lived Assets [Line Items]
U.S. revenue										$ 34,216	$ 32,259	$ 30,948
Total revenue		$ 12,114	$ 11,716	$ 11,939	$ 11,684	$ 11,839	$ 11,301	$ 11,403	$ 11,024	47,453	45,567	44,287
U.S. Noncurrent assets	[1]	23,514				20,658				23,514	20,658	19,637
International Noncurrent assets	[1]	2,614				2,729				2,614	2,729	2,656
Total Noncurrent Assets	[1]	$ 26,128				$ 23,387				26,128	23,387	22,293
FedEx Express Segment [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
International revenue	[1]									12,772	12,916	12,959
Total revenue										27,239	27,121	27,171
FedEx Ground Segment [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
International revenue	[1]									311	248	234
Total revenue										12,984	11,617	10,578
FedEx Freight Segment [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
International revenue	[1]									142	130	112
Total revenue										6,191	5,757	5,401
FedEx Services Segment [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
International revenue	[1]									12	14	34
Total revenue										1,545	1,536	1,580
International Total [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
International revenue	[1]									13,237	13,308	13,339
Consolidated Total [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue										$ 47,453	$ 45,567	$ 44,287

[1] International revenue includes shipments that either originate in or are destined to locations outside the United States which could include U.S. payors. Noncurrent assets include property and equipment, goodwill and other long-term assets. Our flight equipment is registered in the U.S. and is included as U.S. assets; however, many of our aircraft operate internationally.