SEGMENT INFORMATION Continued (Details) - USD ($) $ in Millions		12 Months Ended
		May. 31, 2015	May. 31, 2014	May. 31, 2013
Revenues from external customers and long lived assets [Line Items]
Revenues		$ 38,226	$ 38,275	$ 37,180
Long Lived Assets	[1]	5,119	4,616	4,515
United States [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		17,325	16,809	16,003
Long Lived Assets	[1]	3,341	2,993	2,921
United Kingdom [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		2,388	2,309	2,165
Long Lived Assets	[1]	309	236	203
Germany [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,466	1,483	1,308
Long Lived Assets	[1]	33	35	44
Japan [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,433	1,558	1,770
Long Lived Assets	[1]	338	414	428
Canada [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,286	1,190	1,232
Long Lived Assets	[1]	58	31	34
France [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,044	1,148	1,054
Long Lived Assets	[1]	33	28	17
Other countries [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		13,284	13,778	13,648
Long Lived Assets	[1]	$ 1,007	$ 879	$ 868

[1] Long-lived assets exclude goodwill, intangible assets, equity investments and deferred taxes, which are not allocated to specific geographic locations as it is impracticable to do so.