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RETIREMENT PLANS - Schedule of Retirement Plan Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2025
Nov. 30, 2024
Nov. 30, 2025
Nov. 30, 2024
Retirement Benefits [Abstract]        
Defined benefit pension plans $ 46 $ 70 $ 93 $ 140
Defined contribution plans 312 288 618 575
Postretirement healthcare plans 23 21 45 43
Retirement plans costs $ 381 $ 379 $ 756 $ 758