Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			$ 7,503	$ 11,251
Finance revenues			177	193	$ 160
Operating lease revenue			12	11	$ 24
Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			4,602	7,739
Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			356	399
Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			189	257
Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			388	541
Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			1,698	2,012
Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			102	113
Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			7,335	11,061
Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			137	142
Interest income			58	56
Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			31	48
Interest income			31	48
Military Sales [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net		$ 62
Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			168	190
North America Truck [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			5,240	8,501
North America Truck [Member] | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			4,590	7,727
North America Truck [Member] | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			356	399
North America Truck [Member] | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			189	257
North America Truck [Member] | Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
North America Truck [Member] | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			3	5
North America Truck [Member] | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			102	113
North America Truck [Member] | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			5,240	8,501
North America Truck [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
North America Truck [Member] | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0	0
North America Truck [Member] | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0	0
North America Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			1,841	2,239
North America Parts [Member] | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
North America Parts [Member] | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
North America Parts [Member] | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
North America Parts [Member] | Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			198	309
North America Parts [Member] | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			1,643	1,930
North America Parts [Member] | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
North America Parts [Member] | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			1,841	2,239
North America Parts [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
North America Parts [Member] | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0	0
North America Parts [Member] | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0	0
Global Operations [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			242	309
Global Operations [Member] | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Global Operations [Member] | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Global Operations [Member] | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Global Operations [Member] | Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			190	232
Global Operations [Member] | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			52	77
Global Operations [Member] | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Global Operations [Member] | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			242	309
Global Operations [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Global Operations [Member] | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0	0
Global Operations [Member] | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0	0
Financial Services Operations
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			177	193
Financial Services Operations | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Financial Services Operations | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Financial Services Operations | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Financial Services Operations | Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Financial Services Operations | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Financial Services Operations | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Financial Services Operations | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Financial Services Operations | Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			146	145
Financial Services Operations | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			31	48
Financial Services Operations | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			177	193
Corporate And Eliminations [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			3	9
Corporate And Eliminations [Member] | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			12	12
Corporate And Eliminations [Member] | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Corporate And Eliminations [Member] | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Corporate And Eliminations [Member] | Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Corporate And Eliminations [Member] | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Corporate And Eliminations [Member] | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0	0
Corporate And Eliminations [Member] | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			12	12
Corporate And Eliminations [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			(9)	(3)
Corporate And Eliminations [Member] | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0	0
Corporate And Eliminations [Member] | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			$ (9)	$ (3)
Navistar Defense [Member]
Disaggregation of Revenue [Line Items]
Equity Interest, Percent Sold	70.00%