Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
NET INCOME	$ 1,245	$ 745
OTHER COMPREHENSIVE INCOME (LOSS):
Foreign currency translation adjustments, net of tax benefit of $2 in 2020 and $3 in 2019	129	(83)
Amortization of prior service credit, net of tax benefit of $1 in 2020 and $6 in 2019	(2)	(21)
Other comprehensive income (loss)	127	(104)
COMPREHENSIVE INCOME	$ 1,372	$ 641