INTANGIBLE ASSETS (Details) - USD ($) $ in Millions		3 Months Ended
		Aug. 31, 2018	Aug. 31, 2017	May 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 12,989		$ 12,930
Additions & Adjustments, net	[1]	59
Accumulated Amortization		(6,694)		(6,260)
Expense		(434)	$ (411)
Intangible Assets, Net		6,295		6,670
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		5,400		5,309
Additions & Adjustments, net	[1]	91
Accumulated Amortization		(3,026)		(2,814)
Expense		(212)
Intangible Assets, Net		2,374		2,495
Cloud services and license support agreements and related relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		5,970		5,999
Additions & Adjustments, net	[1]	(29)
Accumulated Amortization		(2,477)		(2,285)
Expense		(192)
Intangible Assets, Net		3,493		3,714
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		1,619		1,622
Additions & Adjustments, net	[1]	(3)
Accumulated Amortization		(1,191)		(1,161)
Expense		(30)
Intangible Assets, Net		$ 428		$ 461

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