Segment Reporting - Summary of Segment Long Lived Assets and Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 2,780	$ 3,042	$ 2,996	$ 2,433	$ 3,317	$ 2,606	$ 2,422	$ 1,905	$ 11,251	$ 10,250	$ 8,570
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	1,017				1,099				1,017	1,099
Sales and revenues, net									9,097	7,223	6,375
Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	3				8				3	8
Sales and revenues, net									280	963	542
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	7				9				7	9
Sales and revenues, net									918	868	708
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	283				249				283	249
Sales and revenues, net									688	933	708
BRAZIL
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 62				$ 73				62	73
Sales and revenues, net									268	263	237
Truck
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									8,496	7,323	5,706
Financial Services Operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									193	160	142
Parts
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									2,021	2,215	2,177
Engine
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									541	552	545
Financial Services Operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Investment Income, Interest									208	182	165
Sales and revenues, net									$ 297	$ 257	235
Reclassification of Sales | Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net											$ 103	$ 23