v3.26.1
RETIREMENT PLANS - Schedule of Net Periodic Benefit (Income) Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Pension Plan | U.S. Pension Plans      
Net Periodic Benefit Cost      
Service cost $ 446 $ 499 $ 544
Interest cost 1,514 1,447 1,362
Expected return on plan assets (1,829) (1,721) (1,598)
Amortization of prior service credit (8) (8) (7)
Actuarial losses (gains) and other (581) (521) (590)
Net periodic benefit (income) cost (458) (304) (289)
Pension Plan | International Pension Plans      
Net Periodic Benefit Cost      
Service cost 40 38 38
Interest cost 48 43 42
Expected return on plan assets (26) (21) (18)
Amortization of prior service credit 0 1 0
Actuarial losses (gains) and other (42) 4 13
Net periodic benefit (income) cost 20 65 75
Postretirement Healthcare Plans      
Net Periodic Benefit Cost      
Service cost 27 26 27
Interest cost 66 65 61
Expected return on plan assets 0 0 0
Amortization of prior service credit (3) (4) (3)
Actuarial losses (gains) and other (24) 2 16
Net periodic benefit (income) cost $ 66 $ 89 $ 101