Commitments and Contingencies (Details) In Millions, unless otherwise specified	3 Months Ended					0 Months Ended		1 Months Ended	12 Months Ended				3 Months Ended			3 Months Ended
	Jan. 31, 2013 USD ($) site	Apr. 30, 2010	Jan. 31, 2013 Non-conformance Penalties [Member] USD ($)	Jan. 31, 2013 Pending Litigation [Member] FATMA Notice, Trial [Member] Penalties [Member] USD ($)	Jan. 31, 2013 Pending Litigation [Member] FATMA Notice, Trial [Member] Penalties [Member] BRL	Jan. 31, 2013 Pending Litigation [Member] Lis Franco vs. Syntex and MWM, Trial [Member] USD ($)	Oct. 25, 2011 Pending Litigation [Member] Lis Franco vs. Syntex and MWM, Trial [Member] BRL	Dec. 31, 2012 Pending Litigation [Member] Lis Franco vs. Syntex and MWM, Trial [Member] BRL	Dec. 31, 1999 Pending Litigation [Member] Lis Franco vs. Syntex and MWM, Trial [Member] Royalties [Member] BRL	May 30, 2010 Pending Litigation [Member] Lis Franco vs. Syntex and MWM, Trial [Member] Royalties [Member] BRL	Dec. 31, 2009 Pending Litigation [Member] Lis Franco vs. Syntex and MWM, Trial [Member] Royalties [Member] BRL	Jan. 31, 2013 Damages from Product Defects [Member] engine	Jan. 31, 2013 Damages from Product Defects [Member] Kruse Technology vs. Ford Motor Company [Member] patents	Jan. 31, 2013 G E Operating Agreement [Domain] USD ($)	Oct. 31, 2012 G E Operating Agreement [Domain] USD ($)	Jan. 31, 2013 Minimum [Member]	Jan. 31, 2013 Maximum [Member]	Apr. 30, 2012 Custom Products Operations Union City and Coburg [Member] Truck [Member] USD ($)
Loss Contingencies [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)																		$ 28
Length of Agreement		3 years
Length Of Potential Automatic Extension Years		1 year
Operating Agreement Excess Loss Percentage														10.00%
Off Balance Sheet Finance Receivables														1,308	1,200
Off Balance Sheet Finance Receivables Related Originations														1,680	1,563
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	63
Line of Credit Facility, Remaining Borrowing Capacity	37
Purchase commitments	69
Long Term Purchase Commitment Cancellation Fees	47
Number of Contaminated Sites	3
Number of Contaminated Sites in Sao Paulo, Brazil	2
Accrual for environmental loss contingencies	22
Damages sought, value				1.00	2.00	11.00	10.85	22.00	42.00
Proceeds from Legal Settlements	35
Potential patent infringement, number of patents													3
Estimate of possible loss									16	74	70
Notice of Violation, number												7,600
Maximum Non-Conformance Penalty per unit	3,775
Number of States	9
10 CARB States	10 CARB States
Regulatory Penalty			$ 10