SEGMENT INFORMATION Continued (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2016	May 31, 2015	May 31, 2014
Revenues from external customers and long lived assets [Line Items]
Revenues		$ 37,047	$ 38,226	$ 38,275
Long Lived Assets	[1]	5,428	5,119	4,616
United States [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		17,264	17,325	16,809
Long Lived Assets	[1]	3,646	3,341	2,993
United Kingdom [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		2,349	2,388	2,309
Long Lived Assets	[1]	334	309	236
Japan [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,465	1,433	1,558
Long Lived Assets	[1]	375	338	414
Germany [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,438	1,466	1,483
Long Lived Assets	[1]	40	33	35
Canada [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,096	1,286	1,190
Long Lived Assets	[1]	44	58	31
France [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,039	1,044	1,148
Long Lived Assets	[1]	26	33	28
Other countries [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		12,396	13,284	13,778
Long Lived Assets	[1]	$ 963	$ 1,007	$ 879

[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.