Segment Reporting - Summary of Segment Long Lived Assets and Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 2,065	$ 1,675	$ 1,925	$ 1,838	$ 2,780	$ 3,042	$ 2,996	$ 2,433	$ 7,503	$ 11,251	$ 10,250
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	1,063				1,017				1,063	1,017
Sales and revenues, net									6,123	9,097	7,223
Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	3				3				3	3
Sales and revenues, net									179	280	963
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	6				7				6	7
Sales and revenues, net									589	918	868
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	252				283				252	283
Sales and revenues, net									397	688	933
BRAZIL
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 30				$ 62				30	62
Sales and revenues, net									215	268	263
Truck
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									5,249	8,496	7,323
Financial Services Operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									168	193	160
Parts
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									1,698	2,021	2,215
Engine
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net									388	541	552
Financial Services Operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Investment Income, Interest									130	208	182
Sales and revenues, net									$ 217	$ 297	257
Reclassification of Sales | Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net											$ 103	$ 23