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General - Schedule of Recently Adopted Accounting Standards (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2018
Aug. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Revenues $ 17,052 $ 15,297
Operating Income 1,071 971
Other Income (Expense), net 30 11
NET INCOME $ 835 596
Effect of Adoption of ASU 2017-07 [Member]    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Operating Income   (146)
Other Income (Expense), net   146
Reported [Member]    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Revenues   15,297
Operating Income   1,117
Other Income (Expense), net   (135)
NET INCOME   $ 596