Retirement and Post-Retirement Benefit Plans - Net Amounts Recognized for the Direct Plans in Combined and Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Oct. 31, 2020	Oct. 31, 2019
Defined Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Non-current assets	$ 1,046	$ 864
Current liabilities	(49)	(45)
Non-current liabilities	(1,715)	(1,610)
Funded status at end of year	(718)	(791)
Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Non-current assets	0	0
Current liabilities	(6)	(6)
Non-current liabilities	(104)	(119)
Funded status at end of year	$ (110)	$ (125)