SEGMENT INFORMATION RECONCILIATION (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Segment reporting information [Line Items]
Total revenue for operating segments		$ 9,771	$ 9,205	$ 28,579	$ 26,835
Cloud and on-premise software revenues	[1]	(5)	(69)	(39)	(121)
Hardware revenues	[1]	0	0	0	(1)
Reconciliation of Total Operating Segment Margin to Income Before Provision for Income Taxes [Abstract]
Total margin for operating segments		5,968	5,582	17,293	16,202
Cloud and on-premise software revenues	[1]	(5)	(69)	(39)	(121)
Hardware revenues	[1]	0	0	0	(1)
Research and development		(1,498)	(1,521)	(4,547)	(4,551)
General and administrative		(340)	(241)	(982)	(859)
Amortization of intangible assets		(394)	(397)	(1,205)	(1,010)
Acquisition related and other		(3)	(30)	(32)	(84)
Restructuring		(91)	(161)	(506)	(346)
Stock-based compensation for operating segments		(123)	(126)	(382)	(306)
Expense allocations and other, net		(104)	(78)	(301)	(288)
Interest expense		(533)	(450)	(1,477)	(1,317)
Non-operating income, net		423	189	929	437
Income before provision for income taxes		3,300	2,698	8,751	7,756
Total for operating segments [Member]
Segment reporting information [Line Items]
Total revenue for operating segments		$ 9,776	$ 9,274	$ 28,618	$ 26,957

[1] Cloud and on-premise software revenues and hardware revenues for management reporting included revenues related to cloud, on-premise software and hardware obligations that would have otherwise been recorded by the acquired businesses as independent entities but were not recognized in our consolidated statements of operations for the periods presented due to business combination accounting requirements. See Note 8 for an explanation of these adjustments and this table for a reconciliation of our total operating segment revenues to our total consolidated revenues as reported in our consolidated statements of operations.