Commitments and Contingencies - Narrative (Details) BRL in Millions		1 Months Ended		3 Months Ended
	Jul. 16, 2015 USD ($)	Oct. 31, 2016 members	Mar. 31, 2014 BRL	Jan. 31, 2018 USD ($) dealer	Oct. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2016 USD ($) employees lawsuits plaintiff	Jul. 31, 2014 lawsuits	Jan. 31, 2014 BRL	Jul. 31, 2010 BRL	Jul. 31, 2015 engine
Loss Contingencies [Line Items]
Long-term Debt				$ 0
Available stand-by letters of credit and surety bonds				117,000,000
Purchase commitments				78,000,000
Long Term Purchase Commitment Cancellation Fees				25,000,000
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral				228,000,000
Accrual for environmental loss contingencies				19,000,000
Damages sought, value				50,000,000	$ 31,000,000
Loss Contingency, Number of Potential Additional Plaintiffs | employees								1,000
Loss Contingency, Number of Plaintiffs		2						25
Loss Contingency, New Claims Filed, Number | lawsuits								2	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				1,360,000
Selling, general and administrative expenses				222,000,000		$ 31,000,000	$ 200,000,000
Loss Contingency, Damages Sought					264,000,000
Sao Paulo Groundwater Notice [Member] | Sanctions [Member]
Loss Contingencies [Line Items]
Damages sought, value			BRL 3	1,000,000
International Chamber of Commerce [Member] | Penalties and Interest [Member]
Loss Contingencies [Line Items]
Damages sought, value				20,000,000
Navitrucks [Member] | Alleged Unfulfilled Promises and Injury to Reputation [Member]
Loss Contingencies [Line Items]
Damages sought, value				$ 40,000,000
G E Operating Agreement [Member]
Loss Contingencies [Line Items]
Operating Agreement Excess Loss Percentage				10.00%
Loss Sharing Agreement, Percentage				9.50%
Off Balance Sheet Finance Receivables				$ 1,400,000,000
Off Balance Sheet Finance Receivables Related Originations1				2,500,000,000	2,400,000,000
Minimum [Member] | Damages from Product Defects [Member] | EPA [Member]
Loss Contingencies [Line Items]
Civil penalties sought, per violation	2,000,000
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				119,000,000	116,000,000
Manufacturing Operations [Member] | Financed lease obligations [Member]
Loss Contingencies [Line Items]
Long-term Debt				135,000,000	130,000,000
Manufacturing Operations [Member] | G E Operating Agreement [Member] | Financed lease obligations [Member]
Loss Contingencies [Line Items]
Long-term Debt				134,000,000	$ 129,000,000
Pending Litigation [Member] | FATMA Notice, Trial [Member] | Penalties [Member]
Loss Contingencies [Line Items]
Damages sought, value				1,000,000							BRL 2
Profit Sharing Litigation [Member] | Pending Litigation [Member] | Disputes [Member]
Loss Contingencies [Line Items]
Damages sought, value								$ 50,000,000
Retiree Health Care [Member]
Loss Contingencies [Line Items]
Damages sought, value				$ 26,000,000
Brazil, Brazil Real | International Chamber of Commerce [Member] | Penalties and Interest [Member]
Loss Contingencies [Line Items]
Damages sought, value | BRL										BRL 64
Brazil, Brazil Real | Navitrucks [Member] | Alleged Unfulfilled Promises and Injury to Reputation [Member]
Loss Contingencies [Line Items]
Damages sought, value | BRL										BRL 128
International Indústria de Motores da América do Sul Ltda [Member] | Other Cases Vs. International Indústria de Motores da América do Sul Ltda [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Truck Fleet Owners | dealer				2