INTANGIBLE ASSETS (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018	May 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 13,203		$ 13,203		$ 12,930
Additions & Adjustments, net	[1]			273
Accumulated Amortization		(7,525)		(7,525)		(6,260)
Expense		(407)	$ (394)	(1,265)	$ (1,205)
Intangible Assets, Net		5,678		$ 5,678		6,670
Weighted Average Useful Life	[2]			3 years
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		5,580		$ 5,580		5,309
Additions & Adjustments, net	[1]			271
Accumulated Amortization		(3,454)		(3,454)		(2,814)
Expense				(640)
Intangible Assets, Net		2,126		$ 2,126		2,495
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		5,984		$ 5,984		5,999
Additions & Adjustments, net	[1]			(15)
Accumulated Amortization		(2,824)		(2,824)		(2,285)
Expense				(539)
Intangible Assets, Net		3,160		$ 3,160		3,714
Weighted Average Useful Life	[2]			4 years
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		1,639		$ 1,639		1,622
Additions & Adjustments, net	[1]			17
Accumulated Amortization		(1,247)		(1,247)		(1,161)
Expense				(86)
Intangible Assets, Net		$ 392		$ 392		$ 461
Weighted Average Useful Life	[2]			5 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 2019.