SEGMENT INFORMATION Continued (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2018	May 31, 2017	May 31, 2016
Revenues from external customers and long lived assets [Line Items]
Revenues		$ 39,831	$ 37,728	$ 37,047
Long-Lived Assets	[1]	7,354	6,728	5,428
United States [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		19,077	17,770	17,264
Long-Lived Assets	[1]	4,976	4,680	3,646
United Kingdom [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		2,172	1,999	2,349
Long-Lived Assets	[1]	510	402	334
Japan [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,693	1,618	1,465
Long-Lived Assets	[1]	388	380	375
Germany [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,375	1,417	1,438
Long-Lived Assets	[1]	179	116	40
Canada [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,143	1,102	1,096
Long-Lived Assets	[1]	78	60	44
Other countries [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		14,371	13,822	13,435
Long-Lived Assets	[1]	$ 1,223	$ 1,090	$ 989

[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.