INCOME TAXES (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Components of Deferred Tax Assets [Abstract]
Accruals and allowances	$ 421	$ 440
Employee compensation and benefits	1,123	1,062
Differences in timing of revenue recognition	335	210
Depreciation and amortization	155	243
Tax credit and net operating loss carryforwards	2,649	2,810
Other		96
Total deferred tax assets	4,683	4,861
Valuation allowance	(1,024)	(1,053)
Net deferred tax assets	993	1,364
Components of Deferred Tax Liabilities [Abstract]
Unrealized gain on stock	(130)	(130)
Acquired intangible assets	(1,879)	(1,804)
Unremitted earnings	(646)	(510)
Other	(11)
Total deferred tax liabilities	(2,666)	(2,444)
Gross Unrecognized Tax Benefits Including Acquisitions [Abstract]
Gross unrecognized tax benefits as of June 1	3,838	3,601	$ 3,276
Increases related to tax positions from prior fiscal years	119	94	279
Decreases related to tax positions from prior fiscal years	(17)	(116)	(125)
Increases related to tax positions taken during current fiscal year	316	307	312
Settlements with tax authorities	(30)	(2)	(71)
Lapses of statutes of limitation	(54)	(53)	(71)
Cumulative translation adjustments and other, net	(134)	7	1
Total gross unrecognized tax benefits as of May 31	4,038	3,838	3,601
Income Taxes [Abstract]
Domestic	5,136	5,397	6,614
Foreign	7,698	8,307	7,284
Income before provision for income taxes	12,834	13,704	13,898
Provision for Income Taxes [Abstract]
Federal	2,153	1,613	1,720
State	310	337	254
Foreign	981	1,047	1,116
Total current provision	3,444	2,997	3,090
Federal	(408)	(68)	(179)
State	(46)	(100)	82
Foreign	(94)	(80)	(20)
Total deferred benefit	(548)	(248)	(117)
Total provision for income taxes	$ 2,896	$ 2,749	$ 2,973
Effective income tax rate	22.60%	20.10%	21.40%