Condensed Consolidated Statements of Changes in Common Stockholders' Investment - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021
Beginning Balance			$ 24,939
Net income	$ 788	$ 1,044	1,663	$ 2,156
Other comprehensive income, net of tax benefit of $10, $5, $28, and $5	(71)	(96)	(282)	(245)
Ending Balance	24,115	24,940	24,115	24,940
Common Stock
Beginning Balance	32	32	32	32
Ending Balance	32	32	32	32
Additional Paid-In Capital
Beginning Balance	3,751	3,610	3,712	3,481
Accelerated share repurchase	(300)		(300)
Employee incentive plans and other	36	43	75	172
Ending Balance	3,487	3,653	3,487	3,653
Retained Earnings
Beginning Balance	33,060	30,462	32,782	29,817
Net income	788	1,044	1,663	2,156
Cash dividends declared ($1.15, $0.75, $3.45, and $2.25 per share)	(291)	(198)	(888)	(598)
Employee incentive plans and other		(1)		(68)
Ending Balance	33,557	31,307	33,557	31,307
Accumulated Other Comprehensive Loss
Beginning Balance	(1,314)	(881)	(1,103)	(732)
Other comprehensive income, net of tax benefit of $10, $5, $28, and $5	(71)	(96)	(282)	(245)
Ending Balance	(1,385)	(977)	(1,385)	(977)
Treasury Stock
Beginning Balance	(10,389)	(8,902)	(10,484)	(8,430)
Purchase of treasury stock (7.9, 0.9, 7.9, and 2.8 million shares)	(1,200)	(199)	(1,200)	(748)
Employee incentive plans and other	13	26	108	103
Ending Balance	$ (11,576)	$ (9,075)	$ (11,576)	$ (9,075)