Business Segment Information (Details 1) - 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
Segment Reporting Information [Line Items]
Revenues		$ 12,114		$ 11,716		$ 11,939		$ 11,684		$ 11,839		$ 11,301		$ 11,403		$ 11,024		$ 47,453		$ 45,567	$ 44,287
Depreciation and amortization																		2,611		2,587	2,386
Operating income		(1,321)	[1]	$ 1,038	[1]	$ 1,088	[1]	$ 1,062	[1]	1,264	[1]	$ 737	[1]	$ 923	[1]	$ 891	[1]	1,867		3,815	4,434
Segment assets		37,069								33,070								37,069		33,070
Capital expenditures																		4,347		3,533	3,375
FedEx Express Segment [Member]
Segment Reporting Information [Line Items]
Revenues																		27,239		27,121	27,171
Depreciation and amortization																		1,460		1,488	1,350
Operating income																		1,584	[2]	1,428	929	[2]
Segment assets	[3]	20,759								19,901								20,759		19,901	18,935
Capital expenditures																		2,380		1,994	2,067
FedEx Ground Segment [Member]
Segment Reporting Information [Line Items]
Revenues																		12,984		11,617	10,578
Depreciation and amortization																		530		468	434
Operating income																		2,172		2,021	1,859	[4]
Segment assets	[3]	11,764								8,466								11,764		8,466	7,353
Capital expenditures																		1,248		850	555
FedEx Freight Segment [Member]
Segment Reporting Information [Line Items]
Revenues																		6,191		5,757	5,401
Depreciation and amortization																		230		231	217
Operating income																		484		351	246	[5]
Segment assets	[3]	3,530								3,216								3,530		3,216	2,953
Capital expenditures																		337		325	326
FedEx Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues																		1,545		1,536	1,580
Depreciation and amortization																		390		399	384
Segment assets	[3]	5,357								5,186								5,357		5,186	4,879
Capital expenditures																		381		363	424
Corporate, eliminations and other [Member]
Segment Reporting Information [Line Items]
Revenues																		(506)		(464)	(443)
Depreciation and amortization																		1		1	1
Operating income	[6]																	(2,373)		15	1,400
Segment assets	[3]	(4,341)								(3,699)								(4,341)		(3,699)	(553)
Capital expenditures																		1		1	3
Consolidated Total [Member]
Segment Reporting Information [Line Items]
Revenues																		47,453		45,567	44,287
Operating income																		1,867		3,815	4,434
Segment assets		$ 37,069								$ 33,070								37,069		33,070	33,567
Capital expenditures																		$ 4,347		$ 3,533	$ 3,375

[1] 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. In addition, the first, second and third quarters of 2015 and all quarters of 2014 have been recast to conform to the current year presentation reflecting the retirement plans accounting changes discussed further in Note 1 and Note 13 and that were included in our June 12, 2015, Form 8-K filing with the Securities and Exchange Commission.

[2] FedEx Express segment 2015 operating income includes $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. FedEx Express segment 2013 operating income includes $405 million of direct and allocated business realignment costs and an impairment charge of $100 million resulting from the decision to retire 10 aircraft and related engines.

[3] Segment assets include intercompany receivables.

[4] FedEx Ground segment 2013 operating income includes $105 million of allocated business realignment costs.

[5] FedEx Freight segment 2013 operating income includes $50 million in direct and allocated business realignment costs.

[6] Operating income includes a loss of $2.2 billion in 2015, a loss of $15 million in 2014 and a gain of $1.4 billion in 2013 associated with our mark-to-market pension accounting. Operating income in 2015 also includes a $197 million charge in the fourth quarter to increase the legal reserve associated with the settlement of a legal matter at FedEx Ground to the amount of the settlement.