| **Income Taxes**                     | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| **Income Tax Disclosure [Abstract]** | Â                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Income Taxes                         | Income taxesWe compute on a quarterly basis an estimated annual effective tax rate considering ordinary income and related income tax expense. Canadian results in 2011 and 2010 are excluded from ordinary income due to ordinary losses for which no benefit can be recognized. Ordinary income refers to income (loss) before income tax expense excluding significant unusual or infrequently occurring items. The tax effect of a significant unusual or infrequently occurring item is recorded in the interim period in which it occurs. Our 2010 annual effective tax rate included a refund for alternative minimum taxes paid in prior years resulting from the Worker, Homeownership, and Business Assistance Act of 2009. Items included in income tax expense in the periods in which they occur include the tax effects of restructuring and impairments, cumulative effect of changes in tax laws or rates, foreign exchange gains and losses, adjustments to uncertain tax positions, and adjustments to our valuation allowance due to changes in judgment regarding the realizability of deferred tax assets in future years. We have evaluated the need to maintain a valuation allowance for deferred tax assets based on our assessment of whether it is more likely than not that deferred tax benefits will be realized through the generation of future taxable income. Appropriate consideration is given to all available evidence, both positive and negative, in assessing the need for a valuation allowance. This evaluation resulted in the determination that a significant portion of our valuation allowance on our U.S. deferred tax assets can be released as of July 31, 2011. The qualitative and quantitative analysis of current and expected domestic earnings, industry volumes, tax planning strategies and general business risks resulted in a more likely than not conclusion of being able to realize a significant portion of our U.S. deferred tax assets.  We have been able to sustain positive cumulative earnings during record low industry volumes during the three previous years. Industry volumes have increased during the year and the increase in volume is expected to continue in the foreseeable future. In addition, we have successfully diversified our business offerings and customer base to be less dependent on the traditional truck industry. We continue to maintain a valuation allowance on certain federal, state, and Canadian deferred tax assets that we believe, on a more likely than not basis, will not be realizable based on current forecasted results. As a result of our analyses, we have recognized an income tax benefit of $1.476 billion and an adjustment to Additional paid in capital of $45 million from the release of valuation allowances during the quarter. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. As of July 31, 2011, the amount of liability for unrecognized tax benefits was $113 million, net of offsetting indirect tax benefits. If the unrecognized tax benefits are recognized, $106 million would impact our effective tax rate. We recognize interest and penalties related to uncertain tax positions as part of Income tax benefit (expense). Total interest and penalties related to our uncertain tax positions are immaterial. |

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| - Definition
The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.
+ References
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