INCOME TAXES (Details) - USD ($) $ in Billions	3 Months Ended
Aug. 31, 2021	Aug. 31, 2020	May 31, 2021
Income Tax Disclosure [Abstract]
Effective income tax rate	8.40%	13.30%
Deferred Tax Assets, Net [Abstract]
Net deferred tax assets	$ 5.7		$ 5.8

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

Name:	us-gaap_DeferredTaxAssetsLiabilitiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant