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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Feb. 28, 2025
Feb. 29, 2024
Feb. 28, 2025
Feb. 29, 2024
Net Periodic Benefit Cost        
Net periodic benefit cost $ 69 $ 92 $ 209 $ 274
Pension Plans [Member] | U.S. Plans [Member]        
Net Periodic Benefit Cost        
Service cost 125 136 374 408
Interest cost 361 341 1,085 1,022
Expected return on plan assets (430) (400) (1,290) (1,199)
Amortization of prior service credit and other (2) (2) (6) (5)
Other retirement plans expense (income) (71) (61) (211) (182)
Net periodic benefit cost 54 75 163 226
Pension Plans [Member] | International Pension Plans [Member]        
Net Periodic Benefit Cost        
Service cost 9 9 29 29
Interest cost 10 10 32 32
Expected return on plan assets (4) (2) (16) (13)
Amortization of prior service credit and other 0 0 1 0
Other retirement plans expense (income) 6 8 17 19
Net periodic benefit cost 15 17 46 48
Postretirement Healthcare Plans [Member]        
Net Periodic Benefit Cost        
Service cost 6 7 19 21
Interest cost 17 15 49 45
Expected return on plan assets 0 0 0 0
Amortization of prior service credit and other (1) (2) (3) (2)
Other retirement plans expense (income) 16 13 46 43
Net periodic benefit cost $ 22 $ 20 $ 65 $ 64