| **Segment Reporting - Segment Assets (Details) (USD $)In Millions, unless otherwise specified**                                           | Apr. 30, 2013 | Oct. 31, 2012 |
|-------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Segment Reporting Information [Line Items]**                                                                                            |          |               |   |  |
| Segment Assets                                                                                                                            | $ 8,723       |               | $ 9,102 |  |
| Truck [Member]                                                                                                                            |          |               |   |  |
| **Segment Reporting Information [Line Items]**                                                                                            |          |               |   |  |
| Segment Assets                                                                                                                            | 2,139         | [1]           | 2,118 | [1] |
| Engine [Member]                                                                                                                           |          |               |   |  |
| **Segment Reporting Information [Line Items]**                                                                                            |          |               |   |  |
| Segment Assets                                                                                                                            | 1,738         |               | 1,777 |  |
| Parts [Member]                                                                                                                            |          |               |   |  |
| **Segment Reporting Information [Line Items]**                                                                                            |          |               |   |  |
| Segment Assets                                                                                                                            | 709           |               | 707 |  |
| Financial Services Operations [Member]                                                                                                    |          |               |   |  |
| **Segment Reporting Information [Line Items]**                                                                                            |          |               |   |  |
| Segment Assets                                                                                                                            | 2,518         |               | 2,563 |  |
| Corporate And Eliminations [Member]                                                                                                       |          |               |   |  |
| **Segment Reporting Information [Line Items]**                                                                                            |          |               |   |  |
| Segment Assets                                                                                                                            | $ 1,619       |               | $ 1,937 |  |
|                                                                                                                                           |
| [1]Includes amounts related to discontinued operations. For more information, see Note 2, Discontinued Operations and Other Divestitures. |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
+ Details**Name:**us-gaap_Assets**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SegmentReportingInformationLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |