SEGMENT INFORMATION (Details) - USD ($) $ in Millions		3 Months Ended
		Aug. 31, 2016	Aug. 31, 2015
Segment reporting information [Line Items]
Revenues		$ 8,595	$ 8,448
Margin		5,110	5,055
Cloud Software and On-Premise Software [Member]
Segment reporting information [Line Items]
Revenues	[1]	1,845	1,603
Cloud software as a service and platform as a service expenses		308	268
Sales and distribution expenses		1,580	1,395
Margin	[2]	(43)	(60)
Cloud infrastructure as a service [Member]
Segment reporting information [Line Items]
Revenues		171	160
Cloud infrastructure as a service expenses		93	85
Sales and distribution expenses		16	22
Margin	[2]	62	53
Software license updates and product support [Member]
Segment reporting information [Line Items]
Revenues	[1]	4,793	4,697
Software license updates and product support expenses		257	271
Margin	[2]	4,536	4,426
Total cloud and on-premise software business [Member]
Segment reporting information [Line Items]
Revenues	[1]	6,809	6,460
Expenses		2,254	2,041
Margin	[2]	4,555	4,419
Hardware products [Member]
Segment reporting information [Line Items]
Revenues		462	570
Hardware products expenses		240	301
Sales and distribution expenses		203	204
Margin	[2]	19	65
Hardware Support [Member]
Segment reporting information [Line Items]
Revenues	[1]	534	559
Hardware support expenses		141	172
Margin	[2]	393	387
Total hardware business [Member]
Segment reporting information [Line Items]
Revenues	[1]	996	1,129
Expenses		584	677
Margin	[2]	412	452
Total services business [Member]
Segment reporting information [Line Items]
Revenues		808	862
Services expenses		665	678
Margin	[2]	143	184
Total for operating segments [Member]
Segment reporting information [Line Items]
Revenues	[1]	8,613	8,451
Expenses		3,503	3,396
Margin	[2]	$ 5,110	$ 5,055

[1] Cloud software and on-premise software, software license updates and product support and hardware support revenues for management reporting included revenues related to cloud SaaS and PaaS, software support and hardware support contracts 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. 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 revenues as reported in our condensed consolidated statements of operations.

[2] The margins reported reflect only the direct controllable costs of each line of business and do not include allocations of product development, corporate, general and administrative and IT expenses. Additionally, the margins reported 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.