Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Current:
Federal	$ (109)	$ 74	$ 1,167
State	81	56	45
Foreign	756	608	533
Total Current	728	738	1,745
Deferred:
Federal	(231)	(33)	595
State	(47)	(9)	25
Foreign	(102)	76	27
Total Deferred	(380)	34	647
Income tax expense	$ 348	$ 772	$ 2,392