| **Condensed consolidating guarantor and non-guarantor financial information (Statement of Operations) (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 9 Months Ended |         | 3 Months Ended | 9 Months Ended |        | 3 Months Ended | 9 Months Ended |         | 3 Months Ended | 9 Months Ended |         | 3 Months Ended | 9 Months Ended |        | 3 Months Ended | 9 Months Ended | 3 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|---------|----------------|----------------|--------|----------------|----------------|---------|----------------|----------------|---------|----------------|----------------|--------|----------------|----------------|----------------|
||
| **Condensed Financial Statements, Captions [Line Items]**                                                                                                        |           |           |    |           |           |   |           |           |    |           |           |    |           |           |   |           |           |           |   |   |   |   |   |   |   |   |  |   |  |   |  |   |  |   |
| Other Assets                                                                                                                                                     |           |           |    |           | $ 733          |   |           |           |    | $ 168          |           |    |           |           | $ 152  |           |           |           |   | $ 416 |   |   |   |   | $ (3) |   |  |   |  |   |  |   |  |   |
| Sales and revenues, net                                                                                                                                          | 3,319          | 3,537          | 9,669   | 9,635          |           | 0      | 0              | 0              | 0       |           | 2,007          | 2,072   | 6,141          | 5,903          |   | 2,941          | 3,260          | 8,776          | 9,079 |   | (1,629) | (1,795) | (5,248) | (5,347) |   | 2,336 | [1] | 2,457 | [1] | 6,856 | [1] | 6,528 | [1] |   |
| Cost of products sold                                                                                                                                            | 2,876          | 2,930          | 8,518   | 7,830          |           | 0      | 0              | 0              | 0       |           | 1,951          | 1,940   | 6,151          | 5,493          |   | 2,554          | 2,774          | 7,577          | 7,620 |   | (1,629) | (1,784) | (5,210) | (5,283) |   |   |  |   |  |   |  |   |  |   |
| Restructuring Charges                                                                                                                                            | 4              | 56             | 24      | 80             |           | 0      | 0              | 0              | 0       |           | 3              | 4       | 23             | 27             |   | 1              | 52             | 1              | 53 |   | 0 | 0 | 0 | 0 |   |   |  |   |  |   |  |   |  | 5 |
| Other Cost and Expense, Operating                                                                                                                                | 529            | 519            | 1,684   | 1,561          |           | 18     | 15             | 57             | 56      |           | 329            | 302     | 1,020          | 915            |   | 206            | 230            | 682            | 671 |   | (24) | (28) | (75) | (81) |   |   |  |   |  |   |  |   |  |   |
| Impairment of Long-Lived Assets to be Disposed of                                                                                                                | 0              | 64             | 38      | 64             |           | 0      |           | 0              | 0       |           | 0              |    | 0              | 0              |   | 0              | 64             | 38             | 64 |   | 0 |   | 0 | 0 |   |   |  |   |  |   |  |   |  |   |
| Total Costs and Expenses                                                                                                                                         | 3,409          | 3,569          | 10,264  | 9,535          |           | 18     | 15             | 57             | 56      |           | 2,283          | 2,246   | 7,194          | 6,435          |   | 2,761          | 3,120          | 8,298          | 8,408 |   | (1,653) | (1,812) | (5,285) | (5,364) |   |   |  |   |  |   |  |   |  |   |
| Equity in loss of non-consolidated affiliates                                                                                                                    | (10)           | (22)           | (21)    | (55)           |           | (30)   | 1,863          | (326)          | 1,983   |           | 16             | (52)    | 384            | 292            |   | (11)           | (9)            | (25)           | (29) |   | 15 | (1,824) | (54) | (2,301) |   | (12) | [1] | (22) | [1] | (27) | [1] | (57) | [1] |   |
| Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest                                                       | (100)          | (54)           | (616)   | 45             |           | (48)   | 1,848          | (383)          | 1,927   |           | (260)          | (226)   | (669)          | (240)          |   | 169            | 131            | 453            | 642 |   | 39 | (1,807) | (17) | (2,284) |   |   |  |   |  |   |  |   |  |   |
| Income Tax Expense (Benefit)                                                                                                                                     | 196            | 1,463          | 410     | 1,458          |           | 132    | (448)          | 142            | (459)   |           | 229            | 1,514   | 243            | 1,515          |   | (187)          | (162)          | 0              | (214) |   | 22 | 559 | 25 | 616 |   | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |   |
| Net Income (Loss), Including Portion Attributable to Noncontrolling Interest                                                                                     | 96             | 1,409          | (206)   | 1,503          |           | 84     | 1,400          | (241)          | 1,468   |           | (31)           | 1,288   | (426)          | 1,275          |   | (18)           | (31)           | 453            | 428 |   | 61 | (1,248) | 8 | (1,668) |   |   |  |   |  |   |  |   |  |   |
| Net Income (Loss) Attributable to Noncontrolling Interest                                                                                                        | 12             | 9              | 35      | 35             |           | 0      | 0              | 0              | 0       |           | 0              | 0       | 0              | 0              |   | 12             | 9              | 35             | 35 |   | 0 | 0 | 0 | 0 |   |   |  |   |  |   |  |   |  |   |
| Net income (loss) attributable to Navistar International Corporation                                                                                             | $ 84           | $ 1,400        | $ (241) | $ 1,468        |           | $ 84   | $ 1,400        | $ (241)        | $ 1,468 |           | $ (31)         | $ 1,288 | $ (426)        | $ 1,275        |   | $ (30)         | $ (40)         | $ 418          | $ 393 |   | $ 61 | $ (1,248) | $ 8 | $ (1,668) |   | $ (30) | [1] | $ (75) | [1] | $ (160) | [1] | $ 49 | [1] |   |
|                                                                                                                                                                  |
| [1]See Note 2, Restructurings and Impairments, for further discussion                                                                                            |

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Total costs related to goods produced and sold during the reporting period.
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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.
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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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Amount of Net Income (Loss) attributable to noncontrolling interest.
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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.
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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
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| - Definition
Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.
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| - Definition
Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.
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