INTANGIBLE ASSETS (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019	May 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 11,414		$ 11,414		$ 11,401
Additions & Adjustments, net	[1]			13
Accumulated Amortization		(8,353)		(8,353)		(7,663)
Expense		(345)	$ (407)	(690)	$ (821)
Intangible Assets, Net		3,061		3,061		3,738
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		4,474		4,474		4,471
Additions & Adjustments, net	[1]			3
Accumulated Amortization		(3,606)		(3,606)		(3,290)
Expense				(316)
Intangible Assets, Net		868		868		1,181
Cloud services and license support agreements and related relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		5,599		5,599		5,589
Additions & Adjustments, net	[1]			10
Accumulated Amortization		(3,600)		(3,600)		(3,271)
Expense				(329)
Intangible Assets, Net		1,999		1,999		2,318
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		1,341		1,341		1,341
Additions & Adjustments, net	[1]			0
Accumulated Amortization		(1,147)		(1,147)		(1,102)
Expense				(45)
Intangible Assets, Net		$ 194		$ 194		$ 239

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