| **Discontinued Operations**                                | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **Discontinued Operations and Disposal Groups [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Discontinued Operations and Other Divestitures             | Discontinued Operations and Other DivestituresThe Company is currently evaluating its portfolio of assets to validate their strategic and financial fit. To allow us to increase our focus on our North American core business, we are evaluating product lines, businesses, and engineering programs that fall outside of our core business. We are using Return on Invested Capital ("ROIC") methodology, combined with an assessment of the strategic fit to our core business, to identify areas that are under-performing. For those areas under-performing, we are evaluating whether to fix, divest, or close, and expect to realize incremental benefits from these actions in the near future.Discontinued OperationsIn the first quarter of 2013, the Company completed the idling of the Workhorse Custom Chassis ("WCC") operations, and in the second quarter of 2013, we completed the divestiture of the WCC business for an immaterial amount. For the three and six months ended April 30, 2013 and 2012, the operating results of the WCC operations, which were previously included as part of the Truck segment, are reported as discontinued operations in the Consolidated Statements of Operations for all periods presented.In the first quarter of 2013, certain operations of the Monaco recreational vehicle ("RV") business ("Monaco") were determined to be held-for-sale. For the three and six months ended April 30, 2013 and 2012, the operating results of these certain operations of Monaco, which were previously included as part of the Truck segment, are reported as discontinued operations in the Consolidated Statements of Operations for all periods presented. In May 2013, we divested substantially all of our interest in these operations of Monaco. The cash consideration from the divestiture was approximately $19 million. As a result of the divestiture, in the second quarter of 2013, we recorded charges of $25 million relating to the impairment of certain assets and the expected loss from the divestiture. The charges were included in the Loss from discontinued operations, net of tax.WCC and Monaco were not material to the Company's Consolidated Balance Sheets or Condensed Consolidated Statements of Cash Flows and have not been reclassified in the respective financial statements.The following table summarizes the discontinued operations activity in the Company's Consolidated Statements of Operations:  Three Months Ended April 30, Six Months Ended April 30,(in millions)2013 2012 2013 2012Sales and revenues, net$36 $37 $70 $80        Loss before income taxes$(21) $(44) $(30) $(58)Income tax benefit— 10 — 15Loss from discontinued operations, net of tax$(21) $(34) $(30) $(43)We generally use a centralized approach to cash management, financing of our manufacturing operations, and general corporate related functions, and, accordingly, do not allocate debt, interest expense, or corporate overhead to our discontinued businesses. Any debt and related interest expense of a specific entity within a business is recorded by the respective entity. Other DivestituresIn 2006 and 2008, we formed two joint ventures with Mahindra & Mahindra Ltd. ("Mahindra") in India, which operated under the names of Mahindra Navistar Automotive Ltd. ("MNAL") and Mahindra-Navistar Engines Private Ltd. ("MNEPL") (collectively, the "Mahindra Joint Ventures"). In the second quarter of 2013, the Company sold its stake in the Mahindra Joint Ventures to Mahindra for $33 million and recognized a gain of $28 million. As part of the transaction, the Company entered into licensing and service agreements with Mahindra. |

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| - Definition
The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).
+ References
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