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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Other retirement plans (income) expense:        
MTM net loss     $ 52  
Pension Plans [Member] | U.S. Plans [Member]        
Net Periodic Benefit Cost        
Service cost $ 213 $ 192 638 $ 576
Other retirement plans (income) expense:        
Interest cost 240 250 719 750
Expected return on plan assets (447) (400) (1,339) (1,201)
Amortization of prior service credit and other (2) (26) (6) (78)
Other retirement plans (income) expense (209) (176) (626) (529)
Net periodic benefit cost 4 16 12 47
Pension Plans [Member] | International Pension Plans [Member]        
Net Periodic Benefit Cost        
Service cost 19 25 68 73
Other retirement plans (income) expense:        
Interest cost 10 11 31 33
Expected return on plan assets (13) (13) (38) (39)
Amortization of prior service credit and other   (1) (1) (2)
MTM net loss     52  
Other retirement plans (income) expense (3) (3) 44 (8)
Net periodic benefit cost 16 22 112 65
Postretirement Healthcare Plans [Member]        
Net Periodic Benefit Cost        
Service cost 11 10 33 31
Other retirement plans (income) expense:        
Interest cost 10 11 29 33
Other retirement plans (income) expense 10 11 29 33
Net periodic benefit cost $ 21 $ 21 $ 62 $ 64