INTANGIBLE ASSETS (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2018	May 31, 2017	May 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 12,930	$ 13,065
Additions		613
Retirements		(748)
Accumulated Amortization		(6,260)	(5,386)
Expense		(1,620)	(1,451)	$ (1,638)
Retirements		746
Intangible Assets, Net		$ 6,670	7,679
Weighted Average Useful Life (in years)	[1]	4 years
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 5,309	5,397
Additions		153
Retirements		(241)
Accumulated Amortization		(2,814)	(2,295)
Expense		(758)
Retirements		239
Intangible Assets, Net		$ 2,495	3,102
Weighted Average Useful Life (in years)	[1]	3 years
Cloud services and license support agreements and related relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 5,999	5,670
Additions		423
Retirements		(94)
Accumulated Amortization		(2,285)	(1,648)
Expense		(731)
Retirements		94
Intangible Assets, Net		$ 3,714	4,022
Weighted Average Useful Life (in years)	[1]	5 years
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 1,622	1,998
Additions		37
Retirements		(413)
Accumulated Amortization		(1,161)	(1,443)
Expense		(131)
Retirements		413
Intangible Assets, Net		$ 461	$ 555
Weighted Average Useful Life (in years)	[1]	5 years

[1] Represents weighted-average useful lives of intangible assets acquired during fiscal 2018