| **Allowance for Doubtful Accounts - Schedule of Impaired Finance Receivables (Details) (USD $)In Millions, unless otherwise specified** | Apr. 30, 2015                                                                                                                                                                                                                                                                          | Oct. 31, 2014                                                                                                                                                                                                                                                                          |
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| Impaired finance receivables with specific loss reserves [Member]                                                                       |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Impaired Financing Receivable, Recorded Investment                                                                                      | $ 20us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinanceReceivablesWithSpecificLossReservesMember                                                                                 | $ 20us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinanceReceivablesWithSpecificLossReservesMember                                                                                 |
| Impaired finance receivables with specific loss reserves [Member] | Retail Portfolio [Member]                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Impaired Financing Receivable, Recorded Investment                                                                                      | 20us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinanceReceivablesWithSpecificLossReservesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember       | 20us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinanceReceivablesWithSpecificLossReservesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember       |
| Impaired finance receivables with specific loss reserves [Member] | Wholesale Portfolio [Member]                                        |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Impaired Financing Receivable, Recorded Investment                                                                                      | 0us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinanceReceivablesWithSpecificLossReservesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember     | 0us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinanceReceivablesWithSpecificLossReservesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember     |
| Impaired financing receivable without specific loss reserves [Member]                                                                   |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Impaired Financing Receivable, Recorded Investment                                                                                      | 7us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinancingReceivableWithoutSpecificLossReservesMember                                                                                | 1us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinancingReceivableWithoutSpecificLossReservesMember                                                                                |
| Impaired financing receivable without specific loss reserves [Member] | Retail Portfolio [Member]                                       |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Impaired Financing Receivable, Recorded Investment                                                                                      | 7us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinancingReceivableWithoutSpecificLossReservesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember    | 1us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinancingReceivableWithoutSpecificLossReservesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember    |
| Impaired financing receivable without specific loss reserves [Member] | Wholesale Portfolio [Member]                                    |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Impaired Financing Receivable, Recorded Investment                                                                                      | 0us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinancingReceivableWithoutSpecificLossReservesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember | 0us-gaap_ImpairedFinancingReceivableRecordedInvestment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_ImpairedFinancingReceivableWithoutSpecificLossReservesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember |
| Specific loss reserves on impaired finance receivables [Member]                                                                         |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Specific loss reserves on impaired finance receivables                                                                                  | 9us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_SpecificLossReservesOnImpairedFinanceReceivablesMember                                                                                        | 6us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_SpecificLossReservesOnImpairedFinanceReceivablesMember                                                                                        |
| Specific loss reserves on impaired finance receivables [Member] | Retail Portfolio [Member]                                             |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Specific loss reserves on impaired finance receivables                                                                                  | 9us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_SpecificLossReservesOnImpairedFinanceReceivablesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember            | 6us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_SpecificLossReservesOnImpairedFinanceReceivablesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember            |
| Specific loss reserves on impaired finance receivables [Member] | Wholesale Portfolio [Member]                                          |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Specific loss reserves on impaired finance receivables                                                                                  | 0us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_SpecificLossReservesOnImpairedFinanceReceivablesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember         | 0us-gaap_ImpairedFinancingReceivableRelatedAllowance/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_SpecificLossReservesOnImpairedFinanceReceivablesMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember         |
| Finance receivable non-accrual status [Member]                                                                                          |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Finance receivables on non-accrual status                                                                                               | 27us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_FinanceReceivableNonAccrualStatusMember                                                                                            | 21us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_FinanceReceivableNonAccrualStatusMember                                                                                            |
| Finance receivable non-accrual status [Member] | Retail Portfolio [Member]                                                              |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Finance receivables on non-accrual status                                                                                               | 27us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_FinanceReceivableNonAccrualStatusMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember                | 21us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_FinanceReceivableNonAccrualStatusMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember                |
| Finance receivable non-accrual status [Member] | Wholesale Portfolio [Member]                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| **Finance Receivable, Impaired [Line Items]**                                                                                           |                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                   |
| Finance receivables on non-accrual status                                                                                               | $ 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_FinanceReceivableNonAccrualStatusMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember            | $ 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= nav_FinanceReceivableNonAccrualStatusMember/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember            |

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| - Details**Name:**us-gaap_FinancingReceivableImpairedLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
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| - Definition
Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524
+ Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
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| - Definition
Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524
+ Details**Name:**us-gaap_ImpairedFinancingReceivableRecordedInvestment**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
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| - Definition
Amount of allowance for credit losses related to recorded investment.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524
+ Details**Name:**us-gaap_ImpairedFinancingReceivableRelatedAllowance**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
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| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nav_FinanceReceivableNonAccrualStatusMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
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| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nav_ImpairedFinanceReceivablesWithSpecificLossReservesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
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| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nav_ImpairedFinancingReceivableWithoutSpecificLossReservesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
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| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nav_SpecificLossReservesOnImpairedFinanceReceivablesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |