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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Pension Plans [Member] | U.S. Plans [Member]      
Net Periodic Benefit Cost      
Service cost $ 679 $ 638 $ 622
Interest cost 1,115 1,128 1,155
Expected return on plan assets (1,624) (1,501) (1,490)
Amortization of prior service credit (118) (118) (118)
Actuarial losses (gains) and other 37 (95) 1,563
Net periodic benefit cost 89 52 1,732
Pension Plans [Member] | International Plans [Member]      
Net Periodic Benefit Cost      
Service cost 97 83 40
Interest cost 49 43 25
Expected return on plan assets (46) (38) (18)
Amortization of prior service credit (2) (2) (3)
Actuarial losses (gains) and other (38) 87 (1)
Net periodic benefit cost 60 173 43
Postretirement Healthcare Plans [Member]      
Net Periodic Benefit Cost      
Service cost 36 36 40
Interest cost 39 39 42
Amortization of prior service credit (1)    
Actuarial losses (gains) and other (9) (14) (64)
Net periodic benefit cost $ 65 $ 61 $ 18