INCOME TAXES - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	May 31, 2020	May 31, 2019
Components of Deferred Tax Assets [Abstract]
Accruals and allowances	$ 469	$ 541
Employee compensation and benefits	638	646
Differences in timing of revenue recognition	524	322
Lease liabilities	253	0
Basis of property, plant and equipment and intangible assets	1,115	1,238
Tax credit and net operating loss carryforwards	3,871	3,717
Total deferred tax assets	6,870	6,464
Valuation allowance	(1,359)	(1,266)
Total deferred tax assets, net	5,511	5,198
Components of Deferred Tax Liabilities [Abstract]
Unrealized gain on stock	(78)	(78)
Acquired intangible assets	(561)	(973)
GILTI deferred	(1,108)	(1,515)
ROU assets	(241)	0
Withholding taxes on foreign earnings	(171)	(91)
Other	(141)	(109)
Total deferred tax liabilities	(2,300)	(2,766)
Net deferred tax assets	$ 3,211	$ 2,432