SEGMENT INFORMATION (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]
Revenues		$ 9,771	$ 9,205	$ 28,579	$ 26,835
Sales and marketing expenses	[1]	2,033	2,004	6,106	5,883
Margin		5,968	5,582	17,293	16,202
Total for operating segments [Member]
Segment reporting information [Line Items]
Revenues	[2]	9,776	9,274	28,618	26,957
Expenses		3,808	3,692	11,325	10,755
Margin	[3]	5,968	5,582	17,293	16,202
Total for operating segments [Member] | Cloud and on-premise software [Member]
Segment reporting information [Line Items]
Revenues	[2]	7,986	7,434	23,229	21,455
Cloud SaaS, PaaS and IaaS expenses		649	491	1,844	1,349
Software license updates and product support expenses		206	253	686	733
Sales and marketing expenses		1,736	1,680	5,196	4,909
Margin	[3]	5,395	5,010	15,503	14,464
Total for operating segments [Member] | Hardware [Member]
Segment reporting information [Line Items]
Revenues	[2]	994	1,028	2,878	3,038
Hardware products and support expenses		388	428	1,097	1,189
Sales and marketing expenses		153	195	479	597
Margin	[3]	453	405	1,302	1,252
Total for operating segments [Member] | Services [Member]
Segment reporting information [Line Items]
Revenues		796	812	2,511	2,464
Services expenses		676	645	2,023	1,978
Margin	[3]	$ 120	$ 167	$ 488	$ 486

[1] Exclusive of amortization of intangible assets, which is shown separately.

[2] Cloud and on-premise software 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 the table below for a reconciliation of our total operating segment revenues to our total consolidated revenues as reported in our consolidated statements of operations.

[3] The margins reported reflect only the direct controllable costs of each line of business and do not include allocations of product development, general and administrative and certain other allocable expenses, net. Additionally, the margins reported above do not reflect amortization of intangible assets, acquisition related and other expenses, restructuring expenses, stock-based compensation, interest expense or certain other non-operating income, net.