| **Summary of Significant Accounting Policies** | 6 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. We operate in four principal industry segments: Truck, 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 12, Segment Reporting.Our fiscal year ends on October 31. As such, all references to 2016 and 2015 contained within this Quarterly Report on Form 10-Q relate to the fiscal year, unless otherwise indicated.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. Reclassifications were made to present the net change in secured revolving credit facilities as a separate line rather than within proceeds from issuance of securitized debt and principal payments on securitized debt in the Condensed Consolidated Statements of Cash Flows. This reclassification did nothave an impact on the amount of net cash from financing activities as reported in our Condensed Consolidated Statements of Cash Flows. 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, 2015, 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 its economic performance and we have the obligation to absorb losses of, 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") joint venture with Ford Motor Company ("Ford").  As a result, our Consolidated Balance Sheets include assets of $49 million and $50 million and liabilities of $9 million and $7 million as of April 30, 2016 and October 31, 2015, respectively, including $2 million and $7 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 do not have recourse to our general credit. Our Financial Services segment consolidates several VIEs. As a result, our Consolidated Balance Sheets include secured assets of $1.0 billion and $1.1 billion as of April 30, 2016 and October 31, 2015, respectively, and liabilities of $870 million and $844 million as of April 30, 2016 and October 31, 2015, respectively, all of which are involved in securitizations that are treated as asset-backed debt. In addition, our Consolidated Balance Sheets include secured assets of $277 million and $235 million as of April 30, 2016 and October 31, 2015, respectively, and corresponding liabilities of $171 million and $107 million, at the respective dates, 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:  Six Months Ended April 30,(in millions)2016 2015Balance at beginning of period$994 $1,197Costs accrued and revenues deferred69 116Currency translation adjustment1 (5)Adjustments to pre-existing warranties(A)51 (39)Payments and revenues recognized(208) (210)Balance at end of period907 1,059Less: Current portion429 496Noncurrent accrued product warranty and deferred warranty revenue$478 $563_________________________(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 second quarter of 2016, we recorded a charge for adjustments to pre-existing warranties of $46 million or $0.56 per diluted share. The pre-existing charges primarily relate to increases in both claim frequency and cost of repair across both the Medium Duty and Big Bore engine families. These charges increase the reserve for Navistar’s standard warranty obligations as well as the loss positions related to our Big Bore extended service contracts. Inthe first quarter of 2015, we recorded a benefit for adjustments to pre-existing warranties of $57 million or $0.70 per diluted share. The impact of income taxes on the adjustments are not material due to our deferred tax valuation allowances on our U.S. deferred tax assets. Extended Warranty ProgramsThe amount of deferred revenue related to extended warranty programs was $367 million and $401 million at April 30, 2016 and October 31, 2015, respectively. Revenue recognized under our extended warranty programs was $38 million and $76 million, in the three and six months ended April 30, 2016, respectively, and $38 million and $75 million for the three and six months ended April 30, 2015, 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, used truck inventory valuations, asbestos and other product liability accruals, asset impairment charges, restructuring 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 our significant unionized workforce. As of April 30, 2016, approximately 5,300, or 79%, 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 future operations may be affected by changes in governmental procurement policies, budget considerations, changing national defense requirements, and political, regulatory and economic developments in the U.S. and certain foreign countries (primarily Canada, Mexico, and Brazil).InventoriesInventories are valued at the lower of cost or market. Our gross used truck inventory increased to approximately $448 million at April 30, 2016 from $390 million at October 31, 2015, offset by reserves of $168 million and $110 million, respectively. During the three and six months ended April 30, 2016, additional reserves of $23 million and $58 million, respectively, were recorded primarily in Costs of products sold.In valuing our used truck inventory, we are required to make assumptions regarding the level of reserves required to value inventories at their net realizable value ("NRV"). Our judgments and estimates for used truck inventory are based on an analysis of current and forecasted sales prices, aging of and demand for used trucks, and the mix of sales through various market channels. The NRV is subject to change based on numerous conditions, including age, specifications, mileage, timing of sales, market mix and current and forecasted pricing. While calculations are made after taking these factors into account, significant management judgment regarding expectations for future events is involved. Future events that could significantly influence our judgment and related estimates include general economic conditions in markets where our products are sold, actions of our competitors, and the ability to sell used trucks in a timely manner.Recently Adopted Accounting Standards  In the six months ended April 30, 2016, we have 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 Financial Accounting Standards Board ("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. In August 2015, the FASB issued ASU No. 2015-14, which postponed the effective date of ASU No. 2014-09 to fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted on the original effective date for fiscal years beginning after December 15, 2016.  Our effective date for this ASU is November 1, 2018. We are currently evaluating the method of adoption and the impact of this ASU on our consolidated financial statements.In February 2016, the FASB issued ASU No. 2016-02, "Leases" (Topic 842). This ASU requires lessees to recognize, on the balance sheet, assets and liabilities for the rights and obligations created by leases of greater than twelve months. The accounting by lessors will remain largely unchanged. The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. Our effective date for this ASU is November 1, 2019. Adoption will require a modified retrospective transition. We are currently evaluating the method of adoption and the impact of this ASU on our consolidated financial statements. |

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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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