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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Other retirement plans (income) expense:        
MTM net loss $ 52   $ 52  
Pension Plans [Member] | U.S. Plans [Member]        
Net Periodic Benefit Cost        
Service cost 212 $ 192 425 $ 384
Other retirement plans (income) expense:        
Interest cost 239 250 479 500
Expected return on plan assets (446) (401) (892) (801)
Amortization of prior service credit and other (2) (25) (4) (52)
Other retirement plans (income) expense (209) (176) (417) (353)
Net periodic benefit cost 3 16 8 31
Pension Plans [Member] | International Pension Plans [Member]        
Net Periodic Benefit Cost        
Service cost 26 24 49 48
Other retirement plans (income) expense:        
Interest cost 11 11 21 22
Expected return on plan assets (13) (13) (25) (26)
Amortization of prior service credit and other   (1) (1) (1)
MTM net loss 52   52  
Other retirement plans (income) expense 50 (3) 47 (5)
Net periodic benefit cost 76 21 96 43
Postretirement Healthcare Plans [Member]        
Net Periodic Benefit Cost        
Service cost 11 10 22 21
Other retirement plans (income) expense:        
Interest cost 9 11 19 22
Other retirement plans (income) expense 9 11 19 22
Net periodic benefit cost $ 20 $ 21 $ 41 $ 43