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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Pension Plans [Member] | U.S. Plans [Member]    
Net Periodic Benefit Cost    
Service cost $ 136 $ 163
Other retirement plans expense (income):    
Interest cost 341 304
Expected return on plan assets (400) (422)
Amortization of prior service credit and other (2) (2)
Other retirement plans (income) expense (61) (120)
Net periodic benefit cost 75 43
Pension Plans [Member] | International Pension Plans [Member]    
Net Periodic Benefit Cost    
Service cost 10 11
Other retirement plans expense (income):    
Interest cost 10 9
Expected return on plan assets (4) (4)
Other retirement plans (income) expense 6 5
Net periodic benefit cost 16 16
Postretirement Healthcare Plans [Member]    
Net Periodic Benefit Cost    
Service cost 7 9
Other retirement plans expense (income):    
Interest cost 16 14
Other retirement plans (income) expense 16 14
Net periodic benefit cost $ 23 $ 23