| **Stockholders' Deficit Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions**      | 3 Months Ended | 9 Months Ended |
|---------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                            |           |           |   |   |
| Accumulated Other Comprehensive Loss, Beginning Balance                                                 | $ (2,536)      | $ (2,284)      | $ (2,601) | $ (2,263) |
| Other comprehensive loss before reclassifications                                                       | (10)           | (47)           | (11) | (133) |
| Amounts reclassified out of accumulated other comprehensive loss                                        | 34             | 33             | 100 | 98 |
| Net current-period other comprehensive income (loss)                                                    | 24             | (14)           | 89 | (35) |
| Accumulated Other Comprehensive Loss, Ending Balance                                                    | (2,512)        | (2,298)        | (2,512) | (2,298) |
| **Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]** |           |           |   |   |
| Total before tax                                                                                        | 28             | 23             | 39 | 113 |
| Tax expense                                                                                             | (14)           | (12)           | (25) | (37) |
| Net income (loss) attributable to Navistar International Corporation                                    | (34)           | (28)           | (63) | (134) |
| Accumulated Net Unrealized Investment Gain (Loss) [Member]                                              |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                            |           |           |   |   |
| Accumulated Other Comprehensive Loss, Beginning Balance                                                 | 1              | 1              | 1 | 1 |
| Other comprehensive loss before reclassifications                                                       | 0              | 0              | 0 | 0 |
| Amounts reclassified out of accumulated other comprehensive loss                                        | 0              | 0              | 0 | 0 |
| Net current-period other comprehensive income (loss)                                                    | 0              | 0              | 0 | 0 |
| Accumulated Other Comprehensive Loss, Ending Balance                                                    | 1              | 1              | 1 | 1 |
| Accumulated Translation Adjustment [Member]                                                             |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                            |           |           |   |   |
| Accumulated Other Comprehensive Loss, Beginning Balance                                                 | (270)          | (213)          | (287) | (127) |
| Other comprehensive loss before reclassifications                                                       | (10)           | (47)           | 7 | (133) |
| Amounts reclassified out of accumulated other comprehensive loss                                        | 0              | 0              | 0 | 0 |
| Net current-period other comprehensive income (loss)                                                    | (10)           | (47)           | 7 | (133) |
| Accumulated Other Comprehensive Loss, Ending Balance                                                    | (280)          | (260)          | (280) | (260) |
| Pension Benefits                                                                                        |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                            |           |           |   |   |
| Accumulated Other Comprehensive Loss, Beginning Balance                                                 | (2,267)        | (2,072)        | (2,315) | (2,137) |
| Other comprehensive loss before reclassifications                                                       | 0              | 0              | (18) | 0 |
| Amounts reclassified out of accumulated other comprehensive loss                                        | 34             | 33             | 100 | 98 |
| Net current-period other comprehensive income (loss)                                                    | 34             | 33             | 82 | 98 |
| Accumulated Other Comprehensive Loss, Ending Balance                                                    | (2,233)        | (2,039)        | (2,233) | (2,039) |
| Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension Benefits              |           |           |   |   |
| **Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]** |           |           |   |   |
| Amortization of prior service costs (benefit)                                                           | 0              | (1)            | (1) | (3) |
| Amortization of actuarial loss                                                                          | 34             | 34             | 101 | 102 |
| Total before tax                                                                                        | 34             | 33             | 100 | 99 |
| Tax expense                                                                                             | 0              | 0              | 0 | (1) |
| Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent                          | $ 34           | $ 33           | $ 100 | $ 98 |

| X                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax, before reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.
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| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
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| - Definition
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No definition available.
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| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.
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