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, 2020	May 31, 2019	May 31, 2018
Current provision (benefit)
Federal		$ (230)	$ (107)	$ (540)
State and local		67	64	43
Foreign		198	243	461
Current Provision, Total		35	200	(36)
Deferred provision (benefit)
Federal		475	(61)	271
State and local		1	(7)	125
Foreign		(128)	(17)	(579)
Deferred Provision, Total	$ 51	348	(85)	(183)
Provision for Income Taxes, Total		$ 383	$ 115	$ (219)