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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2023
Nov. 30, 2022
Nov. 30, 2023
Nov. 30, 2022
Pension Plans [Member] | U.S. Plans [Member]        
Net Periodic Benefit Cost        
Service cost $ 136 $ 163 $ 272 $ 326
Other retirement plans expense (income):        
Interest cost 340 305 681 609
Expected return on plan assets (399) (422) (799) (844)
Amortization of prior service credit and other (1) (2) (3) (4)
Other retirement plans (income) expense (60) (119) (121) (239)
Net periodic benefit cost 76 44 151 87
Pension Plans [Member] | International Pension Plans [Member]        
Net Periodic Benefit Cost        
Service cost 10 10 20 21
Other retirement plans expense (income):        
Interest cost 12 8 22 17
Expected return on plan assets (7) (4) (11) (8)
Other retirement plans (income) expense 5 4 11 9
Net periodic benefit cost 15 14 31 30
Postretirement Healthcare Plans [Member]        
Net Periodic Benefit Cost        
Service cost 7 9 14 18
Other retirement plans expense (income):        
Interest cost 14 14 30 28
Other retirement plans (income) expense 14 14 30 28
Net periodic benefit cost $ 21 $ 23 $ 44 $ 46