Restructuring and Impairments - Restructuring Reserve by Type (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended
	Jul. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Jan. 31, 2017	Jul. 31, 2014	Jul. 31, 2018	Jul. 31, 2017	Oct. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1	$ 6	$ (13)			$ (1)	$ (4)
Restructuring Reserve	9	15	10			9	10	$ 7
Restructuring and Related Cost, Incurred Cost						3	15
Payments for Restructuring						(5)	(12)
Restructuring Reserve, Accrual Adjustment						(4)	0
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	8	14	9			8	9	5
Restructuring and Related Cost, Incurred Cost						3	15
Payments for Restructuring						(5)	(11)
Restructuring Reserve, Accrual Adjustment						(4)	0
Lease Vacancy [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0	0			0	0	1
Restructuring and Related Cost, Incurred Cost						0	0
Payments for Restructuring						0	(1)
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 Benefits Plan [Member] | Chatham [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Postemployment Benefits, Period Expense			$ 23	$ 6	$ 14