INCOME TAXES - Components of Deferred Tax Liabilities and Assets Continued (Details) - USD ($) $ in Millions	May 31, 2019	May 31, 2018
Components of Deferred Tax Assets and Liabilities [Abstract]
Non-current deferred tax assets	$ 2,696	$ 1,395
Non-current deferred tax liabilities (in other non-current liabilities)	(264)	(58)
Net deferred tax assets	$ 2,432	$ 1,337