INCOME TAXES - Components of Benefit from (Provision for) Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Provision for Income Taxes [Abstract]
Federal	$ (516)	$ (1,616)	$ (979)
State	(233)	(19)	(300)
Foreign	(929)	(1,144)	(1,097)
Total current provision	(1,678)	(2,779)	(2,376)
Federal	(8,631)	983	(483)
State	77	(50)	28
Foreign	10,979	(82)	1,646
Total deferred benefit	2,425	851	1,191
Total benefit from (provision for) income taxes	$ 747	$ (1,928)	$ (1,185)
Effective income tax (benefit) expense rate	(5.70%)	16.00%	9.70%