SEGMENT INFORMATION (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014
Segment reporting information [Line Items]
Revenues		$ 8,993	$ 9,598	$ 17,441	$ 18,194
Margin		5,507	6,097	10,671	11,575
Cloud software and on-premise software [Member]
Segment reporting information [Line Items]
Revenues	[1]	2,163	2,407	3,765	4,114
Cloud software as a service and platform as a service expenses		270	158	537	299
Sales and distribution expenses		1,470	1,433	2,756	2,717
Margin	[2]	423	816	472	1,098
Cloud infrastructure as a service [Member]
Segment reporting information [Line Items]
Revenues		165	155	325	293
Cloud infrastructure as a service expenses		88	83	172	158
Sales and distribution expenses		15	21	37	40
Margin	[2]	62	51	116	95
Software license updates and product support [Member]
Segment reporting information [Line Items]
Revenues	[1]	4,683	4,773	9,380	9,505
Software license updates and product support expenses		275	280	546	538
Margin	[2]	4,408	4,493	8,834	8,967
Total cloud and on-premise software business [Member]
Segment reporting information [Line Items]
Revenues	[1]	7,011	7,335	13,470	13,912
Expenses		2,118	1,975	4,048	3,752
Margin	[2]	4,893	5,360	9,422	10,160
Hardware products [Member]
Segment reporting information [Line Items]
Revenues		573	717	1,142	1,295
Hardware products expenses		323	368	625	664
Sales and distribution expenses		216	221	418	420
Margin	[2]	34	128	99	211
Hardware support [Member]
Segment reporting information [Line Items]
Revenues	[1]	550	619	1,109	1,206
Hardware support expenses		167	210	339	393
Margin	[2]	383	409	770	813
Total hardware business [Member]
Segment reporting information [Line Items]
Revenues	[1]	1,123	1,336	2,251	2,501
Expenses		706	799	1,382	1,477
Margin	[2]	417	537	869	1,024
Total services business [Member]
Segment reporting information [Line Items]
Revenues	[1]	862	937	1,726	1,794
Services expenses		665	737	1,346	1,403
Margin	[2]	197	200	380	391
Total for operating segments [Member]
Segment reporting information [Line Items]
Revenues	[1]	8,996	9,608	17,447	18,207
Expenses		3,489	3,511	6,776	6,632
Margin	[2]	$ 5,507	$ 6,097	$ 10,671	$ 11,575

[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.