| **Loss per share attributable to Navistar International Corporation (Details) (USD $)** | 3 Months Ended  | 6 Months Ended |
|-----------------------------------------------------------------------------------------|-----------------|----------------|
||
| **Numerator [Abstract]**                                                                |            |           |   |   |
| Net loss attributable to Navistar International Corporation                             | $ (172,000,000) | $ 74,000,000   | $ (325,000,000) | $ 68,000,000 |
| **Weighted Average Number of Shares Outstanding, Diluted [Abstract]**                   |            |           |   |   |
| Basic (in shares)                                                                       | 68,700,000      | 73,000,000     | 69,300,000 | 72,800,000 |
| Effect of dilutive securities (in shares)                                               | 0               | 5,600,000      | 0 | 4,500,000 |
| Diluted (in shares)                                                                     | 68,700,000      | 78,600,000     | 69,300,000 | 77,300,000 |
| Basic (in dollars per share)                                                            | $ (2.5)         | $ 1.01         | $ (4.69) | $ 0.93 |
| Diluted (in dollars per share)                                                          | $ (2.5)         | $ 0.93         | $ (4.69) | $ 0.87 |
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount         |            | 600,000        | 28,000,000 | 500,000 |
| Convertible Debt Securities [Member]                                                    |            |           |   |   |
| **Weighted Average Number of Shares Outstanding, Diluted [Abstract]**                   |            |           |   |   |
| Debt Instrument, Convertible, Conversion Ratio                                          | 19.891          |           |   |   |
| Debt Instrument Convertible Conversion Ratio Basis                                      | $ 1,000         |           |   |   |
| Debt Instrument, Convertible, Conversion Price                                          | $ 50.27         |           | $ 50.27 |   |
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount         | 11,300,000      |           |   |   |
| Warrants [Member]                                                                       |            |           |   |   |
| **Weighted Average Number of Shares Outstanding, Diluted [Abstract]**                   |            |           |   |   |
| Investment Warrants, Exercise Price                                                     | $ 60.14         |           |   |   |

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| - Definition
Exercise price of the warrants.
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| - Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.
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The price per share of the conversion feature embedded in the debt instrument.
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The ratio applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted.
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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.
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| - Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
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| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -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.
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