Segment Reporting - Summary of Segment Long Lived Assets and Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 3,317	$ 2,606	$ 2,422	$ 1,905	$ 2,598	$ 2,213	$ 2,096	$ 1,663	$ 10,250	$ 8,570	$ 8,111
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	1,099				1,068				1,099	1,068
Sales and revenues, net									7,223	6,375	6,227
Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	8				9				8	9
Sales and revenues, net									963	542	465
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	9				11				9	11
Sales and revenues, net									868	708	604
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	249				226				249	226
Sales and revenues, net									933	708	575
BRAZIL
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 73				$ 90				73	90
Sales and revenues, net									263	237	240
Truck
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									7,323	5,706	5,176
Financial Services Operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									160	142	136
Parts
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									2,215	2,177	2,216
Engine
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									552	545	583
Financial Services Operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Investment Income, Interest									182	165	167
Sales and revenues, net									$ 257	235	235
Reclassification of Sales | UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net										$ 31	41
Reclassification of Sales | Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net											$ 103	$ 23