Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Jan. 31, 2020	Jan. 31, 2019
Disaggregation of Revenue [Line Items]
Finance revenues			$ 44	$ 47
Sales and revenues, net			1,838	2,433
Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			1,078	1,680
Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			97	18
Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			41	51
Engines [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			97	111
Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			456	497
Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			25	29
Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			1,794	2,386
Retail [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			35	35
Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			9	12
Interest income			9	12
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			44	47
North America Truck [Member]
Disaggregation of Revenue [Line Items]
Sales and revenues, net			1,238	1,776
North America Truck [Member] | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			1,075	1,677
North America Truck [Member] | Truck contract manufacturing [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			97	18
North America Truck [Member] | Used Trucks [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			41	51
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			0	1
North America Truck [Member] | Extended warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			25	29
North America Truck [Member] | Manufactured products, net [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			1,238	1,776
North America Truck [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			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 and revenues, net			492	546
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			50	66
North America Parts [Member] | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			442	480
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			492	546
North America Parts [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			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 and revenues, net			61	61
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			47	45
Global Operations [Member] | Parts [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			14	16
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			61	61
Global Operations [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			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]
Finance revenues			46	47
Sales and revenues, net			46	47
Interest Revenue (Expense), Net			35	53
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]
Finance revenues			37	35
Interest Revenue (Expense), Net			15	13
Financial Services Operations | Wholesale financing [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			9	12
Financial Services Operations | Finance Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			46	47
Corporate And Eliminations [Member]
Disaggregation of Revenue [Line Items]
Sales and revenues, net			1	3
Corporate And Eliminations [Member] | Truck products and services [Member]
Disaggregation of Revenue [Line Items]
Sales of manufactured products, net			3	3
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			3	3
Corporate And Eliminations [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Finance revenues			(2)	0
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			$ (2)	$ 0
Navistar Defense [Member]
Disaggregation of Revenue [Line Items]
Equity Interest, Percent Sold	70.00%