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RETIREMENT PLANS - Schedule of MTM Adjustments (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Retirement Benefits [Abstract]      
Actual versus expected return on assets $ 75 $ (67) $ 2,492
Discount rate change (1,024) (1,139) (3,395)
Demographic experience:      
Current year actuarial loss 196 67 142
Change in future assumptions 247 577 110
Pension plan amendments, including curtailment gains (9) 1 1
Total MTM gain $ (515) $ (561) $ (650)