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RETIREMENT PLANS - Schedule of Change in Fair Value of Level 3 Assets (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year $ 26,399  
Actual return on plan assets:    
Balance at end of year 27,245 $ 26,399
U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year 25,797 24,826
Actual return on plan assets:    
Balance at end of year 26,601 25,797
Unobservable
Inputs
Level 3 | U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Balance at beginning of year 1,075 937
Actual return on plan assets:    
Assets held during current year (63) 59
Assets sold during the year 75 30
Purchases, sales, and settlements, net (4) 49
Balance at end of year $ 1,083 $ 1,075