INCOME TAXES - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	May 31, 2018	May 31, 2017
Components of Deferred Tax Liabilities [Abstract]
Unrealized gain on stock	$ (78)	$ (130)
Acquired intangible assets	(1,254)	(2,502)
Unremitted earnings	0	(1,515)
Depreciation and amortization	(158)	(180)
Other	(48)	(23)
Total deferred tax liabilities	(1,538)	(4,350)
Components of Deferred Tax Assets [Abstract]
Accruals and allowances	567	532
Employee compensation and benefits	789	1,251
Differences in timing of revenue recognition	310	385
Tax credit and net operating loss carryforwards	2,614	4,029
Total deferred tax assets	4,280	6,197
Valuation allowance	(1,308)	(1,164)
Net deferred tax assets	$ 1,434	$ 683