| **Condensed consolidating guarantor and non-guarantor financial information (Comprehensive Income) (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 6 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax                                                                        | $ 12           | $ 0            | $ 24 | $ 0 |
| Net loss attributable to Navistar International Corporation                                                                                                   | (172)          | 74             | (325) | 68 |
| Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax                                                        | (65)           | 46             | (78) | 61 |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax                                                     | 17             | 16             | 40 | 79 |
| Other Comprehensive Income (Loss), Net of Tax                                                                                                                 | (48)           | 62             | (38) | 140 |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent                                                                                               | (220)          | 136            | (363) | 208 |
| NIC [Member]                                                                                                                                                  |           |           |   |   |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax                                                                        | 12             | 0              | 24 | 0 |
| Net loss attributable to Navistar International Corporation                                                                                                   | (172)          | 74             | (325) | 68 |
| Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax                                                        | (65)           | 46             | (78) | 61 |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax                                                     | 17             | 16             | 40 | 79 |
| Other Comprehensive Income (Loss), Net of Tax                                                                                                                 | (48)           | 62             | (38) | 140 |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent                                                                                               | (220)          | 136            | (363) | 208 |
| Navistar, Inc. [Member]                                                                                                                                       |           |           |   |   |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax                                                                        | 12             | 0              | 23 | 0 |
| Net loss attributable to Navistar International Corporation                                                                                                   | (201)          | 31             | (396) | (13) |
| Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax                                                        | 0              | 0              | 0 | 0 |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax                                                     | 16             | 12             | 36 | 70 |
| Other Comprehensive Income (Loss), Net of Tax                                                                                                                 | 16             | 12             | 36 | 70 |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent                                                                                               | (185)          | 43             | (360) | 57 |
| Non-Guarantor Subsidiaries [Member]                                                                                                                           |           |           |   |   |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax                                                                        | 0              | 0              | 1 | 0 |
| Net loss attributable to Navistar International Corporation                                                                                                   | 337            | 280            | 448 | 433 |
| Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax                                                        | (65)           | 46             | (78) | 61 |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax                                                     | 2              | 4              | 5 | (15) |
| Other Comprehensive Income (Loss), Net of Tax                                                                                                                 | (63)           | 50             | (73) | 46 |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent                                                                                               | 274            | 330            | 375 | 479 |
| Eliminations and Other [Member]                                                                                                                               |           |           |   |   |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax                                                                        | (12)           | 0              | (24) | 0 |
| Net loss attributable to Navistar International Corporation                                                                                                   | (136)          | (311)          | (52) | (420) |
| Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax                                                        | 65             | (46)           | 78 | (61) |
| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax                                                     | (18)           | (16)           | (41) | (55) |
| Other Comprehensive Income (Loss), Net of Tax                                                                                                                 | 47             | (62)           | 37 | (116) |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent                                                                                               | $ (89)         | $ (373)        | $ (15) | $ (536) |

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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.
+ 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.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The increase (decrease) in accumulated comprehensive income during the period related to pension and other postretirement benefit plans, after tax. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity, net of tax.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents Other Comprehensive Income or Loss, Net of Tax, for the period.  Includes deferred gains or losses on qualifying hedges, unrealized holding gains or losses on available-for-sale securities, minimum pension liability, and cumulative translation adjustment. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.
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