| **Summary of Significant Accounting Policies - Narrative (Details) (USD $)In Millions, unless otherwise specified**                                                                               | 3 Months Ended | 6 Months Ended |         | 3 Months Ended | 6 Months Ended |         |         |         |        |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|---------|----------------|----------------|---------|---------|---------|--------|
||
| **Accounting Policies [Line Items]**                                                                                                                                                              |           |                |    |                |           |         |    |         |   |   |   |   |   |   |   |   |
| Net income (loss) Attributable to Navistar International Corporation                                                                                                                              | $ (374)        |                | $ (172) |                | $ (497)        |         | $ (325) |         |   |   | $ (9) | $ (8) |   |   |   |   |
| Number Of Segments                                                                                                                                                                                |           |                |    |                | 4              |         |    |         |   |   |   |   |   |   |   |   |
| **Risks and Uncertainties [Abstract]**                                                                                                                                                            |           |                |    |                |           |         |    |         |   |   |   |   |   |   |   |   |
| Concentration Risk Number Of Employees                                                                                                                                                            |           |                |    |                |           |         |    |         | 4,600  | 400 |   |   |   |   |   |   |
| concentration risk number of employees percentage                                                                                                                                                 |           |                |    |                |           |         |    |         | 51.00% | 5.00% |   |   |   |   |   |   |
| Sales of manufactured products, net                                                                                                                                                               | 2,487          |                | 3,218   |                | 5,085          |         | 6,183   |         |   |   | 124 | 113 |   |   |   |   |
| Cost of Goods Sold                                                                                                                                                                                | 2,363          |                | 2,900   |                | 4,649          |         | 5,550   |         |   |   | 126 | 113 |   |   |   |   |
| Depreciation and amortization                                                                                                                                                                     | 142            | [1]            | 82      | [1]            | 242            | [1]     | 160     | [1]     |   |   | 46 | 37 |   |   |   |   |
| Interest expense                                                                                                                                                                                  | 90             |                | 62      |                | 164            |         | 123     |         |   |   | 11 | 8 |   |   |   |   |
| Payments to Acquire Equipment on Lease                                                                                                                                                            |           |                |    |                | 295            |         | 28      |         |   |   |   | (185) |   |   |   |   |
| Long-term Debt                                                                                                                                                                                    |           |                |    |                |           |         |    |         |   |   |   |   | 209 | 0 | 209 | 167 |
| Payments to Acquire Property, Plant, and Equipment                                                                                                                                                | 35             | [1],[2]        | 73      | [1],[2]        | 107            | [1],[2] | 176     | [1],[2] |   |   |   | (184) |   |   |   |   |
| Proceeds from finance lease obligations                                                                                                                                                           |           |                |    |                | $ 263          |         | $ 0     |         |   |   |   | $ 201 |   |   |   |   |
|                                                                                                                                                                                                   |
| [1]Includes amounts related to discontinued operations. For more information, see Note 2, Discontinued Operations and Other Divestitures.[2]Exclusive of purchases of equipment leased to others. |

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Total costs related to goods produced and sold during the reporting period.
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The cost of borrowed funds accounted for as interest that was charged against earnings during the period.
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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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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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.
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| - Definition
The cash outflow for payments to acquire rented equipment which is recorded as an asset.
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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.
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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.
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