Commitments and Contingencies - Narrative (Details) R$ in Millions					1 Months Ended		3 Months Ended							9 Months Ended
	Feb. 17, 2020 USD ($)	Nov. 01, 2019 USD ($) part component	Apr. 30, 2019 USD ($)	Jul. 16, 2015 USD ($)	Oct. 31, 2016 members	Mar. 31, 2014 BRL (R$)	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)	Oct. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Jul. 31, 2014 lawsuits	Jul. 31, 2010 BRL (R$)	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 31, 2019 USD ($)	Jul. 31, 2015 engine
Loss Contingencies [Line Items]
Available stand-by letters of credit and surety bonds							$ 85,000,000							$ 85,000,000
Purchase commitments							122,000,000							122,000,000
Long Term Purchase Commitment Cancellation Fees														17,000,000
Accrual for environmental loss contingencies							18,000,000							18,000,000
Damages sought, value									$ 31,000,000
Loss Contingency Accrual																	$ 4,000,000
Loss Contingency, Number of Plaintiffs | members					2
Loss Contingency, New Claims Filed, Number | lawsuits												17
Notice of Violation, number | engine																			7,749
Civil penalties sought, per violation				$ 37,500
Loss Contingency, Overcharge Penalty									88,000,000
Loss Contingency, Damages Sought, Value, Punitive Damages									20,000,000
Legal Fees															$ 1,000,000
Selling, general and administrative expenses							141,000,000	$ 167,000,000						493,000,000	726,000,000
Loss Contingency, Damages Sought									$ 264,000,000
Number of MRAP Contract Parts | part		3
Number of Components | component		13
Sao Paulo Groundwater Notice [Member] | Sanctions [Member]
Loss Contingencies [Line Items]
Damages sought, value						R$ 3								1,000,000
G E Operating Agreement [Member]
Loss Contingencies [Line Items]
Off Balance Sheet Finance Receivables							1,600,000,000							1,600,000,000
Off Balance Sheet Finance Receivables Related Originations1							2,600,000,000							2,600,000,000				$ 2,700,000,000
Minimum [Member] | Damages from Product Defects [Member] | EPA [Member]
Loss Contingencies [Line Items]
Civil penalties sought, per violation				6,000,000
Maximum [Member] | Damages from Product Defects [Member] | EPA [Member]
Loss Contingencies [Line Items]
Civil penalties sought, per violation				$ 291,000,000
G E Operating Agreement [Member]
Loss Contingencies [Line Items]
Equipment leased to others							42,000,000							42,000,000				51,000,000
Manufacturing Operations [Member] | Financed lease obligations [Member]
Loss Contingencies [Line Items]
Long-term Debt							48,000,000							48,000,000				60,000,000
Manufacturing Operations [Member] | G E Operating Agreement [Member] | Financed lease obligations [Member]
Loss Contingencies [Line Items]
Long-term Debt							$ 48,000,000							48,000,000				$ 60,000,000
Pending Litigation [Member] | FATMA Notice, Trial [Member] | Penalties [Member]
Loss Contingencies [Line Items]
Damages sought, value													R$ 2	1,000,000
Profit Sharing Litigation [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Damages sought, value	$ 588,000,000
Loss Contingency, Estimate of Possible Loss	336,000,000
Profit Sharing Litigation [Member] | Pending Litigation [Member] | Disputes [Member]
Loss Contingencies [Line Items]
Damages sought, value											$ 50,000,000
Profit Sharing Litigation [Member] | Pending Litigation [Member] | Profit Sharing Plan [Member]
Loss Contingencies [Line Items]
Damages sought, value	$ 252,000,000
Retiree Health Care [Member]
Loss Contingencies [Line Items]
Damages sought, value														$ 26,000,000
MaxxForce Engine EGR Warranty Litigation [Member]
Loss Contingencies [Line Items]
Common Fund, Balance																$ 135,000,000
Selling, general and administrative expenses										$ 31,000,000					$ 31,000,000
Litigation Settlement, Amount Awarded to Other Party			$ 159,000,000
Loss Contingency Accrual, Period Increase (Decrease)			$ (32,000,000)
MaxxForce Engine EGR Warranty Litigation [Member] | Cash [Member]
Loss Contingencies [Line Items]
Common Fund, Contribution																85,000,000
MaxxForce Engine EGR Warranty Litigation [Member] | Rebate [Member]
Loss Contingencies [Line Items]
Common Fund, Contribution																50,000,000
MaxxForce Engine EGR Warranty Litigation [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Common Fund, Allocation Between Contribution Types																$ 35,000,000
Navistar Defense MRAP Litigation | Pending Litigation [Member]
Loss Contingencies [Line Items]
Damages sought, value		$ 1,300,000,000
Loss Contingency, Treble Damages Sought, Value		$ 3,800,000,000
Number of Components | component		11
Navistar Defense MRAP Litigation | Pending Litigation [Member] | Chasis [Member]
Loss Contingencies [Line Items]
Damages sought, value		$ 1,100,000,000
Navistar Defense MRAP Litigation | Pending Litigation [Member] | Engine [Member]
Loss Contingencies [Line Items]
Damages sought, value		36,000,000
Navistar Defense MRAP Litigation | Pending Litigation [Member] | Relator’s ISS Claim [Member]
Loss Contingencies [Line Items]
Damages sought, value		$ 119,000,000