Consolidated Statements of Changes in Common Stockholders' Investment - USD ($) $ in Millions		12 Months Ended
		May 31, 2022	May 31, 2021	May 31, 2020
Beginning Balance		$ 24,168	$ 18,295	$ 17,757
Net income		3,826	5,231	1,286
Other comprehensive gain (loss), net of tax		(371)	415	(333)
Purchase of treasury stock		(2,248)		(3)
Cash dividends declared		(793)	(686)	(679)
Employee incentive plans and other		357	913	220
Ending Balance		24,939	24,168	18,295
Accounting Standards Update 2018-02
Reclassification to retained earnings due to the adoption of a new accounting standard on June 1, 2019	[1]			51
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-02 and 2018-02
Beginning Balance	[2]		(4)
Ending Balance	[2]			(4)
Common Stock
Beginning Balance		32	32	32
Ending Balance		32	32	32
Additional Paid-In Capital
Beginning Balance		3,481	3,356	3,231
Purchase of treasury stock		(9)
Employee incentive plans and other		240	125	125
Ending Balance		3,712	3,481	3,356
Retained Earnings
Beginning Balance		29,817	25,216	24,648
Net income		3,826	5,231	1,286
Cash dividends declared		(793)	(686)	(679)
Employee incentive plans and other		(68)	56	(35)
Ending Balance		32,782	29,817	25,216
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-02 and 2018-02
Beginning Balance	[2]		(4)
Ending Balance	[2]			(4)
Accumulated Other Comprehensive Loss
Beginning Balance		(732)	(1,147)	(865)
Other comprehensive gain (loss), net of tax		(371)	415	(333)
Ending Balance		(1,103)	(732)	(1,147)
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02
Reclassification to retained earnings due to the adoption of a new accounting standard on June 1, 2019	[1]			51
Treasury Stock
Beginning Balance		(8,430)	(9,162)	(9,289)
Purchase of treasury stock		(2,239)		(3)
Employee incentive plans and other		185	732	130
Ending Balance		$ (10,484)	$ (8,430)	$ (9,162)

[1] Relates to the adoption of ASU 2018-02.

[2] Relates to the adoption of Accounting Standards Update (“ASU”) 2016-02 and ASU 2018-02.