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RETIREMENT PLANS - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Net Periodic Benefit Cost    
Net periodic benefit cost $ 47 $ 70
Pension Plans | U.S. Plans    
Net Periodic Benefit Cost    
Service cost 112 125
Interest cost 378 361
Expected return on plan assets (457) (430)
Amortization of prior service credit and other (2) (2)
Other retirement plans expense (income) (81) (71)
Net periodic benefit cost 31 54
Pension Plans | International Pension Plans    
Net Periodic Benefit Cost    
Service cost 10 9
Interest cost 13 12
Expected return on plan assets (7) (5)
Amortization of prior service credit and other 0 0
Other retirement plans expense (income) 6 7
Net periodic benefit cost 16 16
Postretirement Healthcare Plans    
Net Periodic Benefit Cost    
Service cost 7 7
Interest cost 16 16
Expected return on plan assets 0 0
Amortization of prior service credit and other (1) (1)
Other retirement plans expense (income) 15 15
Net periodic benefit cost $ 22 $ 22