SEGMENT INFORMATION (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Segment reporting information [Line Items]
Revenues		$ 9,012	$ 9,327	$ 26,453	$ 27,520
Margin		5,555	5,879	16,225	17,453
Cloud software and on-premise software [Member]
Segment reporting information [Line Items]
Revenues	[1]	2,265	2,356	6,030	6,469
Cloud software as a service and platform as a service expenses		284	195	822	494
Sales and distribution expenses		1,469	1,390	4,224	4,106
Margin	[2]	512	771	984	1,869
Cloud infrastructure as a service [Member]
Segment reporting information [Line Items]
Revenues		152	155	477	448
Cloud infrastructure as a service expenses		84	84	256	242
Sales and distribution expenses		17	25	54	65
Margin	[2]	51	46	167	141
Software license updates and product support [Member]
Segment reporting information [Line Items]
Revenues	[1]	4,669	4,664	14,049	14,170
Software license updates and product support expenses		276	281	823	820
Margin	[2]	4,393	4,383	13,226	13,350
Total cloud and on-premise software business [Member]
Segment reporting information [Line Items]
Revenues	[1]	7,086	7,175	20,556	21,087
Expenses		2,130	1,975	6,179	5,727
Margin	[2]	4,956	5,200	14,377	15,360
Hardware products [Member]
Segment reporting information [Line Items]
Revenues		604	712	1,746	2,007
Hardware products expenses		337	366	963	1,030
Sales and distribution expenses		197	211	614	632
Margin	[2]	70	135	169	345
Hardware support [Member]
Segment reporting information [Line Items]
Revenues	[1]	531	588	1,640	1,794
Hardware support expenses		165	209	504	602
Margin	[2]	366	379	1,136	1,192
Total hardware business [Member]
Segment reporting information [Line Items]
Revenues	[1]	1,135	1,300	3,386	3,801
Expenses		699	786	2,081	2,264
Margin	[2]	436	514	1,305	1,537
Total services business [Member]
Segment reporting information [Line Items]
Revenues	[1]	793	859	2,519	2,653
Services expenses		630	694	1,976	2,097
Margin	[2]	163	165	543	556
Total for operating segments [Member]
Segment reporting information [Line Items]
Revenues	[1]	9,014	9,334	26,461	27,541
Expenses		3,459	3,455	10,236	10,088
Margin	[2]	$ 5,555	$ 5,879	$ 16,225	$ 17,453

[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 condensed consolidated statements of operations for the periods presented. 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 revenues as reported in our condensed consolidated statements of operations. Our cloud software and on-premise software and services revenues for management reporting also differ from amounts reported per our consolidated statements of operations for the periods presented due to certain insignificant reclassifications between these lines for management reporting purposes.

[2] The margins reported reflect only the direct controllable costs of each line of business and do not include allocations of product development, marketing and partner programs, and corporate, general and administrative and information technology 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 income (expense), net.