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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Pension Plans [Member] | U.S. Plans [Member]    
Net Periodic Benefit Cost    
Service cost $ 192 $ 172
Other retirement plans (income) expense:    
Interest cost 250 238
Expected return on plan assets (400) (377)
Amortization of prior service credit and other (27) (29)
Other retirement plans (income) expense (177) (168)
Net periodic benefit cost 15 4
Pension Plans [Member] | International Pension Plans [Member]    
Net Periodic Benefit Cost    
Service cost 24 24
Other retirement plans (income) expense:    
Interest cost 11 13
Expected return on plan assets (13) (12)
Amortization of prior service credit and other   (1)
Other retirement plans (income) expense (2)  
Net periodic benefit cost 22 24
Postretirement Healthcare Plans [Member]    
Net Periodic Benefit Cost    
Service cost 11 9
Other retirement plans (income) expense:    
Interest cost 11 10
Other retirement plans (income) expense 11 10
Net periodic benefit cost $ 22 $ 19