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Retirement and Post-Retirement Benefit Plans - Schedule of Defined Benefit Plans with Projected Benefit Obligations Exceeding Fair Value of Plan Assets (Details) - Defined Benefit Plans - USD ($)
$ in Millions
Oct. 31, 2018
Oct. 31, 2017
U.S.    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Aggregate fair value of plan assets $ 10,018 $ 10,838
Aggregate projected benefit obligation 11,167 12,266
Non-U.S.    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Aggregate fair value of plan assets 800 750
Aggregate projected benefit obligation $ 1,194 $ 1,085