CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 10,135	$ 11,083	$ 3,587
Other comprehensive (loss) income, net of tax:
Net foreign currency translation losses	(78)	(149)	(291)
Net unrealized (losses) gains on defined benefit plans	(79)	(70)	34
Net unrealized gains (losses) on marketable securities	91	332	(609)
Net unrealized (losses) gains on cash flow hedges	(22)	(52)	37
Total other comprehensive (loss) income, net	(88)	61	(829)
Comprehensive income	$ 10,047	$ 11,144	$ 2,758