Retirement and Post-Retirement Benefit Plans - Schedule of Defined Benefit Plans with Accumulated 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 accumulated 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	734	554
Aggregate accumulated benefit obligation	$ 1,007	$ 777