SEGMENT INFORMATION (Details) - USD ($) $ in Millions		3 Months Ended
		Aug. 31, 2017	Aug. 31, 2016
Segment reporting information [Line Items]
Revenues		$ 9,187	$ 8,595
Sales and marketing expenses	[1]	1,992	1,919
Margin		5,507	5,110
Total for operating segments [Member]
Segment reporting information [Line Items]
Revenues	[2]	9,212	8,613
Expenses		3,705	3,503
Margin	[3]	5,507	5,110
Total for operating segments [Member] | Cloud and on-premise software [Member]
Segment reporting information [Line Items]
Revenues	[2]	7,409	6,809
Cloud SaaS, PaaS and IaaS expenses		580	401
Software license updates and product support expenses		240	257
Sales and marketing expenses		1,684	1,596
Margin	[3]	4,905	4,555
Total for operating segments [Member] | Hardware [Member]
Segment reporting information [Line Items]
Revenues		943	996
Hardware products and support expenses		366	381
Sales and marketing expenses		170	203
Margin	[3]	407	412
Total for operating segments [Member] | Services [Member]
Segment reporting information [Line Items]
Revenues		860	808
Services expenses		665	665
Margin	[3]	$ 195	$ 143

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

[2] Cloud and on-premise software revenues for management reporting included revenues related to cloud and on-premise software 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 7 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. 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.