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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Pension Plans [Member] | U.S. Pension Plans [Member]    
Net Periodic Benefit Cost    
Service cost $ 172 $ 170
Other retirement plans (income) expense:    
Interest cost 238 279
Expected return on plan assets (377) (406)
Amortization of prior service credit and other (29) (30)
Other retirement plans (income) expense (168) (157)
Total net periodic benefit cost 4 13
Pension Plans [Member] | International Pension Plans [Member]    
Net Periodic Benefit Cost    
Service cost 24 23
Other retirement plans (income) expense:    
Interest cost 13 12
Expected return on plan assets (12) (11)
Amortization of prior service credit and other (1)  
Other retirement plans (income) expense   1
Total net periodic benefit cost 24 24
Postretirement Healthcare Plans [Member]    
Net Periodic Benefit Cost    
Service cost 9 9
Other retirement plans (income) expense:    
Interest cost 10 10
Other retirement plans (income) expense 10 10
Total net periodic benefit cost $ 19 $ 19