Restructuring and Impairments - Restructuring Reserve by Type (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jul. 31, 2014	Oct. 31, 2016	Oct. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 7	$ 3
Restructuring Reserve	11	45		$ 7	$ 68
Restructuring and Related Cost, Incurred Cost	6	4
Payments for Restructuring	(2)	(25)
Restructuring Reserve, Accrual Adjustment	0	(2)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	9	42		5	62
Restructuring and Related Cost, Incurred Cost	6	4
Payments for Restructuring	(2)	(22)
Restructuring Reserve, Accrual Adjustment	0	(2)
Lease Vacancy [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1	2		1	5
Restructuring and Related Cost, Incurred Cost	0	0
Payments for Restructuring	0	(3)
Restructuring Reserve, Accrual Adjustment	0	0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	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