Income Taxes - Schedule of Components of Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	May 31, 2020	May 31, 2021	May 31, 2020	May 31, 2019
Current provision (benefit)
Federal		$ 199	$ (230)	$ (107)
State and local		158	67	64
Foreign		284	198	243
Current Provision, Total		641	35	200
Deferred provision (benefit)
Federal		667	475	(61)
State and local		70	1	(7)
Foreign		65	(128)	(17)
Deferred Provision, Total	$ 51	802	348	(85)
Provision for Income Taxes, Total		$ 1,443	$ 383	$ 115