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, 2019	Oct. 31, 2018
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Aggregate fair value of plan assets	$ 12,017	$ 10,018
Aggregate accumulated benefit obligation	13,191	11,167
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Aggregate fair value of plan assets	838	734
Aggregate accumulated benefit obligation	$ 1,226	$ 1,007