Business Segment Information (Details 3) - USD ($) $ in Millions		3 Months Ended												12 Months Ended
		May 31, 2016	[1]	Feb. 29, 2016	[1]	Nov. 30, 2015	[1]	Aug. 31, 2015	May 31, 2015	[2]	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2016		May 31, 2015	May 31, 2014
Entity Wide Information Revenue From External Customer [Line Items]
Revenues		$ 12,979		$ 12,654		$ 12,453		$ 12,279	$ 12,114		$ 11,716	$ 11,939	$ 11,684	$ 50,365		$ 47,453	$ 45,567
FedEx Express Segment [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														26,451		27,239	27,121
FedEx Express Segment [Member] | U.S. overnight box [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														6,763		6,704	6,555
FedEx Express Segment [Member] | U.S. overnight envelope [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														1,662		1,629	1,636
FedEx Express Segment [Member] | U.S. deferred [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														3,379		3,342	3,188
FedEx Express Segment [Member] | Total U.S. domestic package revenue [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														11,804		11,675	11,379
FedEx Express Segment [Member] | International priority [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														5,697		6,251	6,451
FedEx Express Segment [Member] | International economy [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														2,282		2,301	2,229
FedEx Express Segment [Member] | Total international export package revenue [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														7,979		8,552	8,680
FedEx Express Segment [Member] | International domestic [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	[3]													1,285		1,406	1,446
FedEx Express Segment [Member] | Total package revenue [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														21,068		21,633	21,505
FedEx Express Segment [Member] | U.S. freight [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														2,481		2,300	2,355
FedEx Express Segment [Member] | International priority freight [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														1,384		1,588	1,594
FedEx Express Segment [Member] | International airfreight [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														126		180	205
FedEx Express Segment [Member] | Total freight revenue [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														3,991		4,068	4,154
FedEx Express Segment [Member] | Other [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	[4]													1,392		1,538	1,462
FedEx Ground Segment [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														16,574		12,984	11,617
FedEx Ground Segment [Member] | Fedx Ground [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														15,050		12,568	11,617
FedEx Ground Segment [Member] | GENCO [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														1,524		416
FedEx Freight Segment [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														6,200		6,191	5,757
FedEx Services Segment [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														1,593		1,545	1,536
Corporate, eliminations and other
Entity Wide Information Revenue From External Customer [Line Items]
Revenues														$ (453)	[5]	$ (506)	$ (464)

[1] The fourth quarter of 2016 includes a $1.5 billion retirement plans mark-to-market loss and TNT Express transaction, financing and integration planning expenses and immaterial financial results from the time of acquisition totaling $79 million. In addition, the fourth quarter of 2016 includes a $76 million favorable tax impact from an internal corporate restructuring to facilitate the integration of FedEx Express and TNT Express and $11 million of expenses related to independent contractor litigation matters at FedEx Ground. The third quarter of 2016 includes provisions related to independent contractor litigation matters at FedEx Ground for $204 million and expenses related to the settlement of a U.S. Customs and Border Protection notice of action in the amount of $69 million, as well as TNT Express transaction, financing and integration planning expenses of $25 million. The second quarter of 2016 includes provisions related to independent contractor litigation matters at FedEx Ground for $41 million and $19 million of TNT Express transaction, financing and integration planning expenses.

[2] The fourth quarter of 2015 includes a $2.2 billion retirement plans mark-to-market loss, $276 million of impairment and related charges resulting from the decision to permanently retire and adjust the retirement schedule of certain aircraft and related engines at FedEx Express and a $197 million reserve increase due to the settlement of a legal matter at FedEx Ground.

[3] International domestic revenues represent our intra-country operations.

[4] Includes FedEx Trade Networks and FedEx SupplyChain Systems.

[5] Includes TNT Express’s revenue from the time of acquisition (May 25, 2016).