INTANGIBLE ASSETS (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2019	May 31, 2018	May 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 12,688	$ 12,930
Additions & Adjustments, net	[1]	298
Retirements		(540)
Accumulated Amortization		(7,409)	(6,260)
Expense		(1,689)	(1,620)	$ (1,451)
Retirements		540
Intangible Assets, Net		$ 5,279	6,670
Weighted Average Useful Life	[2]	3 years
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 5,406	5,309
Additions & Adjustments, net	[1]	301
Retirements		(204)
Accumulated Amortization		(3,467)	(2,814)
Expense		(857)
Retirements		204
Intangible Assets, Net		$ 1,939	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		$ 5,693	5,999
Additions & Adjustments, net	[1]	(20)
Retirements		(286)
Accumulated Amortization		(2,711)	(2,285)
Expense		(712)
Retirements		286
Intangible Assets, Net		$ 2,982	3,714
Weighted Average Useful Life	[2]	4 years
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross		$ 1,589	1,622
Additions & Adjustments, net	[1]	17
Retirements		(50)
Accumulated Amortization		(1,231)	(1,161)
Expense		(120)
Retirements		50
Intangible Assets, Net		$ 358	$ 461
Weighted Average Useful Life	[2]	5 years

[1] Amounts also include immaterial changes, if any, in net 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