INTANGIBLE ASSETS (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018	May 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 12,722		$ 12,722		$ 12,688
Additions & Adjustments, net	[1]			34
Accumulated Amortization		(8,230)		(8,230)		(7,409)
Expense		(407)	$ (424)	(821)	$ (858)
Intangible Assets, Net		4,492		4,492		5,279
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		5,423		5,423		5,406
Additions & Adjustments, net	[1]			17
Accumulated Amortization		(3,882)		(3,882)		(3,467)
Expense				(415)
Intangible Assets, Net		1,541		$ 1,541		1,939
Weighted Average Useful Life	[2]			5 years
Cloud services and license support agreements and related relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		5,708		$ 5,708		5,693
Additions & Adjustments, net	[1]			15
Accumulated Amortization		(3,053)		(3,053)		(2,711)
Expense				(342)
Intangible Assets, Net		2,655		$ 2,655		2,982
Weighted Average Useful Life	[2]			4 years
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		1,591		$ 1,591		1,589
Additions & Adjustments, net	[1]			2
Accumulated Amortization		(1,295)		(1,295)		(1,231)
Expense				(64)
Intangible Assets, Net		$ 296		$ 296		$ 358
Weighted Average Useful Life	[2]			4 years

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

[2] ^{Represents weighted-average useful lives (in years) of intangible assets acquired during fiscal 2020.}