| **Loss Per Share Attributable to Navistar International Corporation - Basic & Diluted Loss per Share (Details) (USD $)In Millions, except Share data, unless otherwise specified** | 3 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Earnings Per Share [Abstract]**                                                                                                                                                      |           |            |   |   |   |   |   |   |   |   |   |
| Income (loss) from continuing operations, net of tax                                                                                                                                   |           |            |   |   |   |   |   |   | $ (857) | $ (2,939) | $ 1,797 |
| Loss from discontinued operations, net of tax                                                                                                                                          |           |            |   |   |   |   |   |   | (41) | (71) | (74) |
| Net income (loss) attributable to Navistar International Corporation                                                                                                                   |           |            |   |   |   |   |   |   | $ (898) | $ (3,010) | $ 1,723 |
| Weighted Average Number of Shares Outstanding, Basic                                                                                                                                   | 39.79          | 38.81           | 0 | 0 | 26.48 | 35.25 | 0 | 0 | 80,400,000.00 | 69,100,000.00 | 72,800,000.00 |
| Weighted Average Number Diluted Shares Outstanding Adjustment                                                                                                                          |           |            |   |   |   |   |   |   | 0 | 0 | 3,300,000 |
| Weighted Average Number of Shares Outstanding, Diluted                                                                                                                                 | 31.88          | 25.56           | 0 | 0 | 18.17 | 20.21 | 0 | 0 | 80,400,000.00 | 69,100,000.00 | 76,100,000.00 |
| Basic: Loss from Continuing Operations (in dollars per share)                                                                                                                          | $ (1.90)       | $ (2.94)        | $ (4.39) | $ (1.42) | $ (39.67) | $ 1.16 | $ (2.01) | $ (2.06) | $ (10.66) | $ (42.53) | $ 24.68 |
| Basic: Loss from Discontinued Operations (in dollars per share)                                                                                                                        | $ (0.01)       | $ (0.12)        | $ (0.26) | $ (0.11) | $ (0.46) | $ 0.06 | $ (0.49) | $ (0.13) | $ (0.51) | $ (1.03) | $ (1.02) |
| Basic (in dollars per share)                                                                                                                                                           | $ (1.91)       | $ (3.06)        | $ (4.65) | $ (1.53) | $ (40.13) | $ 1.22 | $ (2.50) | $ (2.19) | $ (11.17) | $ (43.56) | $ 23.66 |
| Diluted: Loss from Continuing Operations (in dollars per share)                                                                                                                        | $ (1.90)       | $ (2.94)        | $ (4.39) | $ (1.42) | $ (39.67) | $ 1.16 | $ (2.01) | $ (2.06) | $ (10.66) | $ (42.53) | $ 23.61 |
| Diluted: Loss from Discontinued Operations (in dollars per share)                                                                                                                      | $ (0.01)       | $ (0.12)        | $ (0.26) | $ (0.11) | $ (0.46) | $ 0.06 | $ (0.49) | $ (0.13) | $ (0.51) | $ (1.03) | $ (0.97) |
| Diluted (in dollars per share)                                                                                                                                                         | $ (1.91)       | $ (3.06)        | $ (4.65) | $ (1.53) | $ (40.13) | $ 1.22 | $ (2.50) | $ (2.19) | $ (11.17) | $ (43.56) | $ 22.64 |

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| - Definition
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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| - Definition
Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.
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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.
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| - Definition
The amount of net income (loss) derived from continuing operations during 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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| - Definition
Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.
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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.
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Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.
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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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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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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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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.
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