INTANGIBLE ASSETS (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2017	May 31, 2016	May 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 13,065	$ 11,566
Additions		4,187
Retirements		(2,688)
Accumulated Amortization		(5,386)	(6,623)
Expense		(1,451)	(1,638)	$ (2,149)
Retirements		2,688
Intangible Assets, Net		$ 7,679	4,943
Weighted Average Useful Life (in years)	[1]	6 years
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 5,397	3,661
Additions		1,977
Retirements		(241)
Accumulated Amortization		(2,295)	(1,876)
Expense		(660)
Retirements		241
Intangible Assets, Net		$ 3,102	1,785
Weighted Average Useful Life (in years)	[1]	5 years
SaaS, PaaS and IaaS agreements and related relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 4,105	2,034
Additions		2,084
Retirements		(13)
Accumulated Amortization		(1,089)	(704)
Expense		(398)
Retirements		13
Intangible Assets, Net		$ 3,016	1,330
Weighted Average Useful Life (in years)	[1]	7 years
Software support agreements and related relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 1,565	2,419
Additions		0
Retirements		(854)
Accumulated Amortization		(559)	(1,287)
Expense		(126)
Retirements		854
Intangible Assets, Net		1,006	1,132
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		1,998	3,452
Additions		126
Retirements		(1,580)
Accumulated Amortization		(1,443)	(2,756)
Expense		(267)
Retirements		1,580
Intangible Assets, Net		$ 555	$ 696
Weighted Average Useful Life (in years)	[1]	7 years

[1] Represents weighted-average useful lives of intangible assets acquired during fiscal 2017