INTANGIBLE ASSETS (Details) - USD ($) $ in Millions		3 Months Ended
		Aug. 31, 2019	Aug. 31, 2018	May 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 12,684		$ 12,688
Additions & Adjustments, net	[1]	(4)
Accumulated Amortization		(7,823)		(7,409)
Expense		(414)	$ (434)
Intangible Assets, Net		4,861		5,279
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		5,406		5,406
Additions & Adjustments, net	[1]	0
Accumulated Amortization		(3,678)		(3,467)
Expense		(211)
Intangible Assets, Net		1,728		1,939
Cloud services and license support agreements and related relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		5,689		5,693
Additions & Adjustments, net	[1]	(4)
Accumulated Amortization		(2,882)		(2,711)
Expense		(171)
Intangible Assets, Net		2,807		2,982
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		1,589		1,589
Additions & Adjustments, net	[1]	0
Accumulated Amortization		(1,263)		(1,231)
Expense		(32)
Intangible Assets, Net		$ 326		$ 358

[1] Amounts also include any changes in intangible asset balances for the periods presented that resulted from foreign currency translations.