Condensed Consolidated Statements of Changes in Common Stockholders' Investment - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Beginning Balance			$ 27,582
Net income	$ 741	$ 900	1,535	$ 1,978
Other comprehensive (loss)/income, net of tax benefit/(expense)	(183)	62	(156)	33
Ending Balance	26,460	26,766	26,460	26,766
Common Stock
Beginning Balance	32	32	32	32
Ending Balance	32	32	32	32
Additional Paid-In Capital
Beginning Balance	4,134	3,800	3,988	3,769
Purchase of treasury stock	(12)	2	(21)	(34)
Employee incentive plans and other	43	47	198	114
Ending Balance	4,165	3,849	4,165	3,849
Retained Earnings
Beginning Balance	38,767	36,021	38,649	35,259
Net income	741	900	1,535	1,978
Cash dividends declared	(333)	(316)	(1,009)	(632)
Ending Balance	39,175	36,605	39,175	36,605
Accumulated Other Comprehensive Loss
Beginning Balance	(1,332)	(1,356)	(1,359)	(1,327)
Other comprehensive (loss)/income, net of tax benefit/(expense)	(183)	62	(156)	33
Ending Balance	(1,515)	(1,294)	(1,515)	(1,294)
Treasury Stock
Beginning Balance	(14,425)	(11,963)	(13,728)	(11,645)
Purchase of treasury stock	(1,001)	(509)	(1,995)	(974)
Employee incentive plans and other	29	46	326	193
Ending Balance	$ (15,397)	$ (12,426)	$ (15,397)	$ (12,426)