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RETIREMENT PLANS - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2025
Nov. 30, 2024
Nov. 30, 2025
Nov. 30, 2024
Net Periodic Benefit Cost        
Net periodic benefit cost $ 46 $ 70 $ 93 $ 140
Pension Plans | U.S. Plans        
Net Periodic Benefit Cost        
Service cost 111 124 223 249
Interest cost 379 363 757 724
Expected return on plan assets (457) (430) (914) (860)
Amortization of prior service credit and other (2) (2) (4) (4)
Other retirement plans expense (income) (80) (69) (161) (140)
Net periodic benefit cost 31 55 62 109
Pension Plans | International Pension Plans        
Net Periodic Benefit Cost        
Service cost 10 11 20 20
Interest cost 11 10 24 22
Expected return on plan assets (6) (7) (13) (12)
Amortization of prior service credit and other 0 1 0 1
Other retirement plans expense (income) 5 4 11 11
Net periodic benefit cost 15 15 31 31
Postretirement Healthcare Plans        
Net Periodic Benefit Cost        
Service cost 7 6 14 13
Interest cost 17 16 33 32
Expected return on plan assets 0 0 0 0
Amortization of prior service credit and other (1) (1) (2) (2)
Other retirement plans expense (income) 16 15 31 30
Net periodic benefit cost $ 23 $ 21 $ 45 $ 43