| **Consolidated Statements of Comprehensive Loss (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 9 Months Ended |
|--------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Statement of Comprehensive Income [Abstract]**                                                 |           |           |   |   |
| Net loss attributable to Navistar International Corporation                                      | $ (2)          | $ (247)        | $ (547) | $ (744) |
| **Other comprehensive income (loss):**                                                           |           |           |   |   |
| Foreign currency translation adjustment                                                          | (3)            | (91)           | (17) | (71) |
| Defined benefit plans (net of tax of $(3), $1, $(4), and $2, respectively)                       | 33             | 39             | 83 | 117 |
| Total other comprehensive income (loss)                                                          | 30             | (52)           | 66 | 46 |
| Total comprehensive income (loss) attributable to Navistar International Corporation             | $ 28           | $ (299)        | $ (481) | $ (698) |

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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity.
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| - Definition
Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.
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Amount after tax of other comprehensive income (loss) attributable to parent entity.
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