SEGMENT INFORMATION Continued (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2019	May 31, 2018	May 31, 2017
Revenues from external customers and long lived assets [Line Items]
Revenues		$ 39,506	$ 39,383	$ 37,792
Long-Lived Assets	[1]	7,869	7,354	6,728
United States [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		18,596	18,330	17,856
Long-Lived Assets	[1]	5,318	4,976	4,680
United Kingdom [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		2,054	2,093	1,988
Long-Lived Assets	[1]	423	510	402
Japan [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,848	1,716	1,619
Long-Lived Assets	[1]	422	388	380
Germany [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,583	1,526	1,415
Long-Lived Assets	[1]	263	179	116
Canada [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		1,166	1,200	1,102
Long-Lived Assets	[1]	87	78	60
Other countries [Member]
Revenues from external customers and long lived assets [Line Items]
Revenues		14,259	14,518	13,812
Long-Lived Assets	[1]	$ 1,356	$ 1,223	$ 1,090

[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.