Restructuring and Impairments - Restructuring Reserve by Type (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Apr. 30, 2017	Jan. 31, 2017	Apr. 30, 2016	Jul. 31, 2014	Apr. 30, 2017	Apr. 30, 2016	Oct. 31, 2016	Oct. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2		$ 3		$ 9	$ 6
Restructuring Reserve	10		22		10	22	$ 7	$ 68
Restructuring and Related Cost, Incurred Cost					8	6
Payments for Restructuring					(4)	(52)
Restructuring Reserve, Accrual Adjustment					(1)	0
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	9		19		9	19	5	62
Restructuring and Related Cost, Incurred Cost					8	6
Payments for Restructuring					(3)	(49)
Restructuring Reserve, Accrual Adjustment					(1)	0
Lease Vacancy [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0		2		0	2	1	5
Restructuring and Related Cost, Incurred Cost					0	0
Payments for Restructuring					(1)	(3)
Restructuring Reserve, Accrual Adjustment					0	0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 1		$ 1		1	1	$ 1	$ 1
Restructuring and Related Cost, Incurred Cost					0	0
Payments for Restructuring					0	0
Restructuring Reserve, Accrual Adjustment					$ 0	$ 0
Other Postretirement Benefit Plan [Member] | Chatham [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Postemployment Benefits, Period Expense		$ 6		$ 14