| **Condensed Consolidating Guarantor and Non-Guarantor - Statement of Comprehsive Income (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| Net income (loss) attributable to Navistar International Corporation                                                                               | $ (2,769)      | $ 84            | $ (172) | $ (153) | $ 255 | $ 1,400 | $ 74 | $ (6) | $ (3,010) | $ 1,723 | $ 223 |
| **Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Foreign currency translation adjustment                                                                                                            |           |            |   |   |   |   |   |   | (125) | (19) | 22 |
| Defined Benefit Plans                                                                                                                              |           |            |   |   |   |   |   |   | (256) | (729) | 472 |
| Total other comprehensive income (loss)                                                                                                            |           |            |   |   |   |   |   |   | (381) | (748) | 494 |
| Total comprehensive income (loss) attributable to Navistar International Corporation                                                               |           |            |   |   |   |   |   |   | (3,391) | 975 | 717 |
| Parent Company [Domain]                                                                                                                            |           |            |   |   |   |   |   |   |   |   |   |
| Net income (loss) attributable to Navistar International Corporation                                                                               |           |            |   |   |   |   |   |   | (3,010) | 1,723 | 223 |
| **Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Foreign currency translation adjustment                                                                                                            |           |            |   |   |   |   |   |   | (125) | (19) | 22 |
| Defined Benefit Plans                                                                                                                              |           |            |   |   |   |   |   |   | (256) | (729) | 472 |
| Total other comprehensive income (loss)                                                                                                            |           |            |   |   |   |   |   |   | (381) | (748) | 494 |
| Total comprehensive income (loss) attributable to Navistar International Corporation                                                               |           |            |   |   |   |   |   |   | (3,391) | 975 | 717 |
| Guarantor Subsidiaries [Domain]                                                                                                                    |           |            |   |   |   |   |   |   |   |   |   |
| Net income (loss) attributable to Navistar International Corporation                                                                               |           |            |   |   |   |   |   |   | (3,100) | 1,647 | 62 |
| **Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Foreign currency translation adjustment                                                                                                            |           |            |   |   |   |   |   |   | 0 | 0 | 0 |
| Defined Benefit Plans                                                                                                                              |           |            |   |   |   |   |   |   | (225) | (725) | 511 |
| Total other comprehensive income (loss)                                                                                                            |           |            |   |   |   |   |   |   | (225) | (725) | 511 |
| Total comprehensive income (loss) attributable to Navistar International Corporation                                                               |           |            |   |   |   |   |   |   | (3,325) | 922 | 573 |
| Non-Guarantor Subsidiaries [Domain]                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Net income (loss) attributable to Navistar International Corporation                                                                               |           |            |   |   |   |   |   |   | 668 | 600 | 1,133 |
| **Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Foreign currency translation adjustment                                                                                                            |           |            |   |   |   |   |   |   | (125) | (11) | 22 |
| Defined Benefit Plans                                                                                                                              |           |            |   |   |   |   |   |   | (31) | (4) | (39) |
| Total other comprehensive income (loss)                                                                                                            |           |            |   |   |   |   |   |   | (156) | (15) | (17) |
| Total comprehensive income (loss) attributable to Navistar International Corporation                                                               |           |            |   |   |   |   |   |   | 512 | 585 | 1,116 |
| Consolidation, Eliminations [Domain]                                                                                                               |           |            |   |   |   |   |   |   |   |   |   |
| Net income (loss) attributable to Navistar International Corporation                                                                               |           |            |   |   |   |   |   |   | 2,432 | (2,247) | (1,195) |
| **Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Foreign currency translation adjustment                                                                                                            |           |            |   |   |   |   |   |   | 125 | 11 | (22) |
| Defined Benefit Plans                                                                                                                              |           |            |   |   |   |   |   |   | 256 | 729 | (472) |
| Total other comprehensive income (loss)                                                                                                            |           |            |   |   |   |   |   |   | 381 | 740 | (494) |
| Total comprehensive income (loss) attributable to Navistar International Corporation                                                               |           |            |   |   |   |   |   |   | 2,813 | (1,507) | (1,689) |
| Consolidated Entities [Member]                                                                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| **Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Defined Benefit Plans                                                                                                                              |           |            |   |   |   |   |   |   | $ (256) |   |   |

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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.
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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
Net of tax and reclassification adjustments amount of the increase (decrease) in accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans, attributable to the parent entity.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax and reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency, which is attributable to the parent entity.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net of tax amount of other comprehensive income (loss) attributable to the parent entity.
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