Commitments and Contingencies - Narrative (Details)	6 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended			3 Months Ended	12 Months Ended	6 Months Ended		6 Months Ended						6 Months Ended	3 Months Ended
	Apr. 30, 2015 USD ($) site	Mar. 31, 2014 Sao Paulo Groundwater Notice [Member] Sanctions [Member] BRL	Apr. 30, 2015 Sao Paulo Groundwater Notice [Member] Sanctions [Member] USD ($)	Jan. 31, 2014 International Chamber of Commerce [Member] Penalties and Interest [Member] dealer	Jan. 31, 2014 International Chamber of Commerce [Member] Penalties and Interest [Member] BRL	Jan. 31, 2014 Navitrucks [Member] Alleged Unfulfilled Promises and Injury to Reputation [Member] BRL	Apr. 30, 2012 Damages from Product Defects [Member] engine	Apr. 30, 2013 California Air Resources Board (CARB) [Member] USD ($)	Oct. 31, 2014 California Air Resources Board (CARB) [Member] USD ($)	Apr. 30, 2015 G E Operating Agreement [Member] USD ($)	Oct. 31, 2014 G E Operating Agreement [Member] USD ($)	Apr. 30, 2015 Minimum [Member]	Apr. 30, 2015 Maximum [Member]	Apr. 30, 2015 G E Operating Agreement [Member] USD ($)	Apr. 30, 2015 Manufacturing Operations [Member] Financed lease obligations [Member] USD ($)	Oct. 31, 2014 Manufacturing Operations [Member] Financed lease obligations [Member] USD ($)	Apr. 30, 2015 Manufacturing Operations [Member] G E Operating Agreement [Member] Financed lease obligations [Member] USD ($)	Apr. 30, 2015 Pending Litigation [Member] Disputes [Member] USD ($)	Apr. 30, 2015 Pending Litigation [Member] FATMA Notice, Trial [Member] Penalties [Member] USD ($)	Apr. 30, 2015 Pending Litigation [Member] FATMA Notice, Trial [Member] Penalties [Member] BRL	Apr. 30, 2015 IIAA Vs. Navitrucks [Member] USD ($)	Apr. 30, 2015 IIAA Vs. Navitrucks [Member] BRL	Apr. 30, 2015 Navitrucks Vs. IIAA [Member] USD ($)	Apr. 30, 2015 Navitrucks Vs. IIAA [Member] BRL
Loss Contingencies [Line Items]
Operating Agreement Excess Loss Percentage										10.00%
Loss Sharing Agreement, Percentage										9.50%
Off Balance Sheet Finance Receivables										$ 1,600,000,000	$ 1,500,000,000
Off Balance Sheet Finance Receivables Related Originations										2,300,000,000	2,300,000,000
Equipment leased to others														129,000,000
Long-term Debt															141,000,000	184,000,000	139,000,000
Historical losses on finance receivables, measured as percentage of average balance of related finance receivable												0.30%	2.10%
Available stand-by letters of credit and surety bonds	88,000,000
Line of Credit Facility, Current Borrowing Capacity	11,000,000
Line of Credit Facility, Remaining Borrowing Capacity	7,000,000
Purchase commitments	120,000,000
Long Term Purchase Commitment Cancellation Fees	33,000,000
Number of Contaminated Sites	2
Number of Contaminated Sites in Sao Paulo, Brazil	2
Accrual for environmental loss contingencies	22,000,000
Damages sought, value		3,000,000	1,000,000		64,000,000	128,000,000												50,000,000	1,000,000	2,000,000
Loss Contingency, Number of Plaintiffs				4
Notice of Violation, number							7,600
Regulatory Penalty								2,500,000	300,000
Gain Contingency, Unrecorded Amount																					24,000,000	71,000,000
Loss Contingency, Estimate of Possible Loss																							$ 61,000,000	182,000,000