INCOME TAXES (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 3,533	$ 4,033	$ 5,136
Foreign	7,984	7,409	7,698
Income before provision for income taxes	11,517	11,442	12,834
Provision for Income Taxes [Abstract]
Federal	936	1,301	2,153
State	257	271	310
Foreign	1,475	1,074	981
Total current provision	2,668	2,646	3,444
Federal	(201)	(123)	(408)
State	(36)	(21)	(46)
Foreign	(249)	39	(94)
Total deferred benefit	(486)	(105)	(548)
Total provision for income taxes	$ 2,182	$ 2,541	$ 2,896
Effective income tax rate	18.90%	22.20%	22.60%
Components of Deferred Tax Liabilities [Abstract]
Unrealized gain on stock	$ (130)	$ (130)
Acquired intangible assets	(2,502)	(1,482)
Unremitted earnings	(1,515)	(987)
Depreciation and amortization	(180)	0
Other	(23)	(33)
Total deferred tax liabilities	(4,350)	(2,632)
Components of Deferred Tax Assets [Abstract]
Accruals and allowances	532	492
Employee compensation and benefits	1,251	1,149
Differences in timing of revenue recognition	385	351
Depreciation and amortization	0	9
Tax credit and net operating loss carryforwards	4,029	2,935
Total deferred tax assets	6,197	4,936
Valuation allowance	(1,164)	(1,173)
Net deferred tax assets	683	1,131
Gross Unrecognized Tax Benefits Including Acquisitions [Abstract]
Gross unrecognized tax benefits as of June 1	4,561	4,038	$ 3,838
Increases related to tax positions from prior fiscal years	128	350	119
Decreases related to tax positions from prior fiscal years	(218)	(111)	(17)
Increases related to tax positions taken during current fiscal year	595	461	316
Settlements with tax authorities	(85)	(73)	(30)
Lapses of statutes of limitation	(47)	(73)	(54)
Cumulative translation adjustments and other, net	(15)	(31)	(134)
Total gross unrecognized tax benefits as of May 31	$ 4,919	$ 4,561	$ 4,038