| **Summary of Significant Accounting Policies** | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| **Accounting Policies [Abstract]**             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| Summary of Significant Accounting Policies     | Summary of Significant Accounting PoliciesOrganization and Description of the BusinessNavistar International Corporation ("NIC"), incorporated under the laws of the State of Delaware in 1993, is a holding company whose principal operating entities are Navistar, Inc. and Navistar Financial Corporation ("NFC"). References herein to the "Company," "we," "our," or "us" refer collectively to NIC and its consolidated subsidiaries, including certain variable interest entities ("VIEs") of which we are the primary beneficiary. Our fiscal year ends October 31. As such, all references to 2014 and 2013 contained within this Quarterly Report on Form 10-Q relate to our fiscal year, unless otherwise indicated. We operate in four principal industry segments: North America Truck, North America Parts, Global Operations (collectively called "Manufacturing operations"), and Financial Services, which consists of NFC and our foreign finance operations (collectively called "Financial Services operations"). These segments are discussed in Note 13, Segment Reporting.Basis of Presentation and ConsolidationThe accompanying unaudited consolidated financial statements include the assets, liabilities, and results of operations of our Manufacturing operations, which include majority-owned dealers ("Dealcors"), and our Financial Services operations, including VIEs of which we are the primary beneficiary. The effects of transactions among consolidated entities have been eliminated to arrive at the consolidated amounts. Certain reclassifications were made to prior period amounts to conform to the 2014 presentation, which relate to the realignment of our reporting segments that became effective during the fourth quarter of 2013.We prepared the accompanying unaudited consolidated financial statements in accordance with United States ("U.S.") generally accepted accounting principles ("U.S. GAAP") for interim financial information and the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X issued by the U.S. Securities and Exchange Commission ("SEC"). Accordingly, they do not include all of the information and notes required by U.S. GAAP for comprehensive annual financial statements.The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting policies described in our Annual Report on Form 10-K for the year ended October 31, 2013, which should be read in conjunction with the disclosures therein. In our opinion, these interim consolidated financial statements reflect all adjustments, consisting of normal recurring adjustments, necessary to present fairly the financial condition, results of operations, and cash flows for the periods presented. Operating results for interim periods are not necessarily indicative of annual operating results.Variable Interest EntitiesWe have an interest in several VIEs, primarily joint ventures, established to manufacture or distribute products and enhance our operational capabilities. We have determined for certain of our VIEs that we are the primary beneficiary because we have the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and have the obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. Accordingly, we include in our consolidated financial statements the assets and liabilities and results of operations of those entities, even though we may not own a majority voting interest. The liabilities recognized as a result of consolidating these VIEs do not represent additional claims on our general assets; rather they represent claims against the specific assets of these VIEs. Assets of these entities are not readily available to satisfy claims against our general assets.We are the primary beneficiary of our Blue Diamond Parts ("BDP") and Blue Diamond Truck ("BDT") joint ventures with Ford. As a result, our Consolidated Balance Sheets include assets of $279 million and $323 million and liabilities of $235 million and $188 million as of July 31, 2014 and October 31, 2013, respectively, from BDP and BDT, including $48 million and $56 million of cash and cash equivalents, at the respective dates, which are not readily available to satisfy claims against our general assets. The creditors of BDP and BDT do not have recourse to our general credit. In December 2011, Ford notified the Company of its intention to dissolve the BDT joint venture effective December 2014. In September 2013, we agreed with Ford to extend the BDT joint venture through February 2015. We do not expect the dissolution of the BDT joint venture to have a material impact on our consolidated financial statements.Our Financial Services segment consolidates several VIEs. As a result, our Consolidated Balance Sheets include assets of $1 billion and $989 million as of July 31, 2014 and October 31, 2013, respectively, and liabilities of $828 million and $778 million as of July 31, 2014 and October 31, 2013, respectively, all of which are involved in securitizations that are treated as asset-backed debt. In addition, our Consolidated Balance Sheets include assets of $190 million and $61 million and corresponding liabilities of $69 million and $49 million as of July 31, 2014 and October 31, 2013, respectively, which are related to other secured transactions that do not qualify for sale accounting treatment, and therefore, are treated as borrowings secured by operating and finance leases. Investors that hold securitization debt have a priority claim on the cash flows generated by their respective securitized assets to the extent that the related VIEs are required to make principal and interest payments. Investors in securitizations of these entities have no recourse to our general credit.We also have an interest in other VIEs, which we do not consolidate because we are not the primary beneficiary. Our financial support and maximum loss exposure relating to these non-consolidated VIEs are not material to our financial condition, results of operations, or cash flows.We use the equity method to account for our investments in entities that we do not control under the voting interest or variable interest models, but where we have the ability to exercise significant influence over operating and financial policies. Equity in income of non-consolidated affiliates includes our share of the net income of these entities.Product Warranty Liability The following table presents accrued product warranty and deferred warranty revenue activity:  Nine Months Ended July 31,(in millions)2014 2013Balance at beginning of period$1,349 $1,118Costs accrued and revenues deferred235 342Divestitures— (3)Currency translation adjustment(2) (3)Adjustments to pre-existing warranties(A)(B)65 252Payments and revenues recognized(391) (484)Balance at end of period1,256 1,222Less: Current portion578 618Noncurrent accrued product warranty and deferred warranty revenue$678 $604_________________________(A)Adjustments to pre-existing warranties reflect changes in our estimate of warranty costs for products sold in prior periods. Such adjustments typically occur when claims experience deviates from historic and expected trends. Our warranty liability is generally affected by component failure rates, repair costs, and the timing of failures. Future events and circumstances related to these factors could materially change our estimates and require adjustments to our liability. In addition, new product launches require a greater use of judgment in developing estimates until historical experience becomes available. Inthe first quarter of 2014, we recorded adjustments for changes in estimates of $52 million or $0.64 per diluted share. In the second quarter of 2014, we recorded adjustments for changes in estimates of $42 million, or $0.52 per diluted share. In the third quarter of 2014, we recognized a benefit for adjustments to pre-existing warranties of $(29) million, or (0.36) per diluted share.  The benefit is comprised of a benefit for changes in estimates of $(59) million, partially offset by a $30 million correction of prior-period errors, primarily related to pre-existing warranties.  For more information on the errors identified, see Out-of-Period Warranty Adjustments below.  The impact of income taxes on the 2014 adjustments is not material due to our deferred tax valuation allowances on our U.S. deferred tax assets.Inthe first quarter of 2013, we recorded adjustments for changes in estimates of $40 million or $0.50 per diluted share. In the second quarter of 2013, we recorded adjustments for changes in estimates of $164 million, or $2.04 per diluted share. In the third quarter of 2013, we recorded adjustments for changes in estimates of $48 million, or $0.60 per diluted share. The impact of income taxes on the 2013 adjustments is not material due to our deferred tax valuation allowances on our U.S. deferred tax assets.(B)In the first quarter of 2013, we recognized $13 million of charges for adjustments to pre-existing warranties for a specific warranty issue related to component parts from a supplier. Also during the first quarter of 2013, we reached an agreement for reimbursement from this supplier for this amount and other costs previously accrued. As a result of this agreement, we recognized a recovery of $27 million within Costs of products sold and recorded a receivable within Other current assets. In the second quarter of 2013, we recognized a warranty recovery of $13 million within Loss from discontinued operations, net of tax and recorded a receivable within Other current assets.Out-of-Period Warranty AdjustmentsIncluded in the adjustments to the product warranty liability for the three and nine months ended July 31, 2014 are out-of-period adjustments, which represent corrections of prior-period errors related to the accounting for product warranties.  As disclosed in our Annual Report on Form 10-K for our fiscal year ended October 31, 2013 and in Item 4, we concluded that a material weakness exists surrounding the validation of the completeness and accuracy of underlying data, specifically related to our warranty cost estimates.  As part of our remediation efforts for our material weakness, we have performed substantive procedures to-date that identified incomplete data used in calculating our warranty accrual.  The impact of the out-of-period warranty adjustments resulted in a $30 million and a $24 million increase to the warranty liability, primarily impacting adjustments to pre-existing warranties in the third quarter and the first nine months of 2014, respectively.Extended Warranty ProgramsThe amount of deferred revenue related to extended warranty programs was $437 million and $420 million at July 31, 2014 and October 31, 2013, respectively. Revenue recognized under our extended warranty programs was $36 million and $96 million in the three and nine months ended July 31, 2014, respectively, and $23 million and $63 million for the three and nine months ended July 31, 2013, respectively. Use of EstimatesThe preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses for the periods presented. Significant estimates and assumptions are used for, but are not limited to, pension and other postretirement benefits, allowance for doubtful accounts, income tax contingency accruals and valuation allowances, product warranty accruals, asbestos and other product liability accruals, asset impairment charges, and litigation-related accruals. Actual results could differ from our estimates.Concentration RisksOur financial condition, results of operations, and cash flows are subject to concentration risks related to concentrations of our union employees. As of July 31, 2014, approximately 6,000, or 68%, of our hourly workers and approximately 300, or 5%, of our salaried workers are represented by labor unions and are covered by collective bargaining agreements. Our current master collective bargaining agreement with the UAW will expire in October 2014 and we are in negotiations with the UAW to enter into a new collective bargaining agreement. Our future operations may be affected by changes in governmental procurement policies, budget considerations, changing national defense requirements, and global, political, regulatory and economic developments in the U.S. and certain foreign countries (primarily Canada, Mexico, and Brazil).Goodwill and Indefinite-Lived Intangible AssetsGoodwill represents the excess of the cost of an acquired business over the amounts assigned to the net assets. Goodwill is not amortized but is tested for impairment at a reporting unit level on an annual basis or more frequently, if circumstances change or an event occurs that would more likely than not reduce the fair value of a reporting unit below its carrying amount. Qualitative factors may be assessed to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the qualitative assessment indicates that the carrying amount is more likely than not higher than the fair value, goodwill is tested for impairment based on a two-step test. The first step compares the fair value of a reporting unit with its carrying amount, including goodwill. If the fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is considered not impaired, thus the second step of the impairment test is unnecessary. If the carrying amount of a reporting unit exceeds its fair value, the second step of the goodwill impairment test shall be performed to measure the amount of impairment loss, if any. The second step compares the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. If the carrying amount of reporting unit goodwill exceeds the implied fair value of that goodwill, an impairment loss shall be recognized in an amount equal to that excess. Significant judgment is applied when goodwill is assessed for impairment. This judgment includes developing cash flow projections, selecting appropriate discount rates, identifying relevant market comparables, incorporating general economic and market conditions, and selecting an appropriate control premium. The income approach is based on discounted cash flows which are derived from internal forecasts and economic expectations for each respective reporting unit. An intangible asset determined to have an indefinite useful life is not amortized until its useful life is determined to no longer be indefinite. Indefinite-lived intangible assets are evaluated each reporting period to determine whether events and circumstances continue to support an indefinite useful life. Indefinite-lived intangible assets are tested for impairment annually or more frequently if events or changes in circumstances indicate that the asset might be impaired. The impairment test consists of a comparison of the fair value of the indefinite-lived intangible asset with its carrying amount. If the carrying amount of an indefinite-lived intangible asset exceeds its fair value, an impairment loss is recognized in an amount equal to that excess. Significant judgment is applied when evaluating if an intangible asset has a finite useful life. In addition, for indefinite-lived intangible assets, significant judgment is applied in testing for impairment. This judgment includes developing cash flow projections, selecting appropriate discount rates, identifying relevant market comparables, and incorporating general economic and market conditions.  During the second quarter of 2014, the economic downturn in Brazil resulted in the continued decline in actual and forecasted results for the Brazilian engine reporting unit with goodwill of $142 million and an indefinite-lived intangible asset, trademark, of $43 million. As a result, we performed an impairment analysis in the second quarter utilizing the income approach, based on discounted cash flows, which are derived from internal forecasts and economic expectations. It was determined that the carrying value of the Brazilian engine reporting unit, including goodwill, exceeded its fair value. As a result we compared the implied fair value of the reporting unit's goodwill with the carrying amount of that goodwill. A decrease in the enterprise value of the reporting unit coupled with appreciation in the value of certain tangible assets, which are not recognized for accounting purposes, resulted in the determination that the entire $142 million of goodwill was impaired. In addition, we determined that the related trademark was impaired and recognized an impairment charge of $7 million. The non-cash impairment charges were included in Asset impairment charges in the Company's Consolidated Statements of Operations. The Brazilian engine reporting unit is included in the Global Operations segment.Recently Adopted Accounting Standards  In the nine months ended July 31, 2014, the Company has not adopted any new accounting guidance that has had a material impact on our consolidated financial statements.Recently Issued Accounting Standards  In May 2014, the FASB issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition.  This ASU is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.  The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. This new guidance is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is not permitted. Our effective date is November 1, 2017. We are currently evaluating the impact and method of adoption of this ASU on our consolidated financial statements. |

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| - Definition
The entire disclosure for the general note to the financial statements for the reporting entity which may include, descriptions of the basis of presentation, business description, significant accounting policies, consolidations, reclassifications, new pronouncements not yet adopted and changes in accounting principles.
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