INTANGIBLE ASSETS (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020	May 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 11,454		$ 11,454		$ 11,401
Additions & Adjustments, net	[1]			53
Accumulated Amortization		(8,700)		(8,700)		(7,663)
Expense		(347)	$ (400)	(1,037)	$ (1,221)
Intangible Assets, Net		2,754		2,754		3,738
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		4,507		4,507		4,471
Additions & Adjustments, net	[1]			36
Accumulated Amortization		(3,767)		(3,767)		(3,290)
Expense				(477)
Intangible Assets, Net		740		$ 740		1,181
Weighted Average Useful Life	[2]			3 years
Cloud services and license support agreements and related relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		5,605		$ 5,605		5,589
Additions & Adjustments, net	[1]			16
Accumulated Amortization		(3,764)		(3,764)		(3,271)
Expense				(493)
Intangible Assets, Net		1,841		$ 1,841		2,318
Weighted Average Useful Life	[2]			0 years
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		1,342		$ 1,342		1,341
Additions & Adjustments, net	[1]			1
Accumulated Amortization		(1,169)		(1,169)		(1,102)
Expense				(67)
Intangible Assets, Net		$ 173		$ 173		$ 239
Weighted Average Useful Life	[2]			0 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 2021.