INCOME TAXES - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	May 31, 2019	May 31, 2018
Components of Deferred Tax Assets [Abstract]
Accruals and allowances	$ 541	$ 567
Employee compensation and benefits	646	664
Differences in timing of revenue recognition	322	338
Basis of property, plant and equipment and intangible assets	1,238	0
Tax credit and net operating loss carryforwards	3,717	2,614
Total deferred tax assets	6,464	4,183
Valuation allowance	(1,266)	(1,308)
Total deferred tax assets, net	5,198	2,875
Components of Deferred Tax Liabilities [Abstract]
Unrealized gain on stock	(78)	(78)
Acquired intangible assets	(973)	(1,254)
GILTI deferred	(1,515)	0
Basis of property, plant and equipment and intangible assets	0	(158)
Other	(200)	(48)
Total deferred tax liabilities	(2,766)	(1,538)
Net deferred tax assets	$ 2,432	$ 1,337