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Consolidated Statements of Changes in Common Stockholders' Investment - USD ($)
$ in Millions
 12 Months Ended
May 31, 2023
May 31, 2022
May 31, 2021
Beginning Balance $ 24,939 $ 24,168 $ 18,295
Net income 3,972 3,826 5,231
Other comprehensive gain (loss), net of tax (224) (371) 415
Purchase of treasury stock (1,500) (2,248)  
Cash dividends declared (1,495) (793) (686)
Employee incentive plans and other 396 357 913
Ending Balance 26,088 24,939 24,168
Common Stock      
Beginning Balance 32 32 32
Ending Balance 32 32 32
Additional Paid-In Capital      
Beginning Balance 3,712 3,481 3,356
Purchase of treasury stock (82) (9)  
Employee incentive plans and other 139 240 125
Ending Balance 3,769 3,712 3,481
Retained Earnings      
Beginning Balance 32,782 29,817 25,216
Net income 3,972 3,826 5,231
Cash dividends declared (1,495) (793) (686)
Employee incentive plans and other   (68) 56
Ending Balance 35,259 32,782 29,817
Accumulated Other Comprehensive Loss      
Beginning Balance (1,103) (732) (1,147)
Other comprehensive gain (loss), net of tax (224) (371) 415
Ending Balance (1,327) (1,103) (732)
Treasury Stock      
Beginning Balance (10,484) (8,430) (9,162)
Purchase of treasury stock (1,418) (2,239)  
Employee incentive plans and other 257 185 732
Ending Balance $ (11,645) $ (10,484) $ (8,430)