Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
NET INCOME	$ 5,231	$ 1,286	$ 540
OTHER COMPREHENSIVE LOSS:
Foreign currency translation adjustments, net of tax expense of $13 in 2021 and tax benefits of $18 in 2020 and $29 in 2019	422	(254)	(195)
Amortization of prior service credit and other, net of tax benefits of $3 in 2021, $25 in 2020, and $28 in 2019	(7)	(79)	(92)
Other comprehensive income (loss)	415	(333)	(287)
COMPREHENSIVE INCOME	$ 5,646	$ 953	$ 253