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, 2019	Oct. 31, 2018	Oct. 31, 2017
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			$ 11,251
Finance revenues			193	$ 160	$ 142
Operating lease revenue			11	$ 24	$ 26
Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			7,739
Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			399
Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			257
Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			541
Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			2,012
Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			113
Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			11,061
Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			142
Interest income			56
Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			48
Interest income			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			190
North America Truck [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			8,501
North America Truck [Member] | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			7,727
North America Truck [Member] | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			399
North America Truck [Member] | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			257
North America Truck [Member] | Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
North America Truck [Member] | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			5
North America Truck [Member] | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			113
North America Truck [Member] | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			8,501
North America Truck [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
North America Truck [Member] | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0
North America Truck [Member] | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0
North America Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			2,239
North America Parts [Member] | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
North America Parts [Member] | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
North America Parts [Member] | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
North America Parts [Member] | Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			309
North America Parts [Member] | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			1,930
North America Parts [Member] | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
North America Parts [Member] | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			2,239
North America Parts [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
North America Parts [Member] | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0
North America Parts [Member] | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0
Global Operations [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			309
Global Operations [Member] | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Global Operations [Member] | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Global Operations [Member] | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Global Operations [Member] | Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			232
Global Operations [Member] | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			77
Global Operations [Member] | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Global Operations [Member] | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			309
Global Operations [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Global Operations [Member] | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0
Global Operations [Member] | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0
Financial Services Operations
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			193
Financial Services Operations | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Financial Services Operations | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Financial Services Operations | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Financial Services Operations | Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Financial Services Operations | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Financial Services Operations | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Financial Services Operations | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Financial Services Operations | Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			145
Financial Services Operations | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			48
Financial Services Operations | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			193
Corporate And Eliminations [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			9
Corporate And Eliminations [Member] | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			12
Corporate And Eliminations [Member] | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Corporate And Eliminations [Member] | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Corporate And Eliminations [Member] | Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Corporate And Eliminations [Member] | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Corporate And Eliminations [Member] | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			0
Corporate And Eliminations [Member] | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			12
Corporate And Eliminations [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			(3)
Corporate And Eliminations [Member] | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			0
Corporate And Eliminations [Member] | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			$ (3)
Navistar Defense [Member]
Disaggregation of Revenue [Line Items]
Equity Interest, Percent Sold	70.00%