Restructuring and Impairments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended							6 Months Ended
	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Jul. 31, 2014	Apr. 30, 2018	Apr. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1		$ 6	$ 41	$ 2			$ (2)	$ 9
Pension Liability				23
Restructuring Benefit				8
Inventory Reserve Charge				10
Liability, Defined Benefit Plan, Noncurrent	2,422		2,497					2,422
Restructuring and Related Cost, Incurred Cost								1	8
Asset impairment charges	1				$ 5			3	7
Goodwill	$ 38		$ 38					38
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost								0	0
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost								1	8
Lease Vacancy [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost								0	$ 0
Melrose Park [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 2
North America Truck [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges								1
Global Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1
Other Postretirement Benefits Plan [Member] | Chatham [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Postemployment Benefits, Period Expense				23		$ 6	$ 14
Liability, Defined Benefit Plan, Noncurrent				$ 66
Cherokee [Domain]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges								$ 2