| **Commitments and Contingencies - Narrative (Details)**                                                           | 3 Months Ended                                                  | 1 Months Ended                                                                                                                                                                                                             | 3 Months Ended                                                                                                                                                                                                             | 0 Months Ended                                                                                                                                                                                                                              |                                                                                                                                                                                                                                             | 3 Months Ended                                                                                                                                                                                                                                     | 12 Months Ended                                                                                                                                                                                                                                     | 3 Months Ended                                                                                                                                                                                                                                     |                                                                                                                                                                                                                                                     | 3 Months Ended                                                                                                                         |                                                                                                                                 |                                                                                                                               |                                                                                                                                       | 3 Months Ended                                                                                                                        |
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| **Loss Contingencies [Line Items]**                                                                               |                                                            |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Operating Agreement Excess Loss Percentage                                                                        |                                                            |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          | 10.00%nav_OperatingAgreementExcessLossPercentage/ us-gaap_TypeOfArrangementAxis= nav_GEOperatingAgreementMember                       |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Loss Sharing Agreement, Percentage                                                                                |                                                            |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          | 9.50%nav_LossSharingAgreementPercentage/ us-gaap_TypeOfArrangementAxis= nav_GEOperatingAgreementMember                                |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Off Balance Sheet Finance Receivables                                                                             |                                                            |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          | $ 1,500,000,000nav_OffBalanceSheetFinanceReceivables/ us-gaap_TypeOfArrangementAxis= nav_GEOperatingAgreementMember                   |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Off Balance Sheet Finance Receivables Related Originations                                                        |                                                            |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          | 2,200,000,000nav_OffBalanceSheetFinanceReceivablesRelatedOriginations1/ us-gaap_TypeOfArrangementAxis= nav_GEOperatingAgreementMember | 2,300,000,000nav_OffBalanceSheetFinanceReceivablesRelatedOriginations1/ us-gaap_TypeOfArrangementAxis= nav_GEOperatingAgreementMember |   |   |   |   |   |   |   |   |   |
| Equipment leased to others                                                                                        |                                                            |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   | 139,000,000nav_Equipmentleasedtoothers/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis= nav_GEOperatingAgreementMember |   |   |   |   |   |   |
| Long-term Debt                                                                                                    |                                                            |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   | 160,000,000us-gaap_LongTermDebt/ us-gaap_LongtermDebtTypeAxis= nav_FinancedLeaseObligationsMember/ us-gaap_StatementBusinessSegmentsAxis= nav_ManufacturingOperationsMember | 184,000,000us-gaap_LongTermDebt/ us-gaap_LongtermDebtTypeAxis= nav_FinancedLeaseObligationsMember/ us-gaap_StatementBusinessSegmentsAxis= nav_ManufacturingOperationsMember | 158,000,000us-gaap_LongTermDebt/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis= nav_GEOperatingAgreementMember/ us-gaap_LongtermDebtTypeAxis= nav_FinancedLeaseObligationsMember/ us-gaap_StatementBusinessSegmentsAxis= nav_ManufacturingOperationsMember |   |   |   |
| Historical losses on finance receivables, measured as percentage of average balance of related finance receivable |                                                            |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  | 0.30%nav_HistoricLossesOnFinanceReceivablesMeasuredAsPercentageOfAverageBalanceOfRelatedFinanceReceivable/ us-gaap_RangeAxis= us-gaap_MinimumMember | 2.10%nav_HistoricLossesOnFinanceReceivablesMeasuredAsPercentageOfAverageBalanceOfRelatedFinanceReceivable/ us-gaap_RangeAxis= us-gaap_MaximumMember |   |   |   |   |   |   |   |
| Available stand-by letters of credit and surety bonds                                                             | 88,000,000us-gaap_LettersOfCreditOutstandingAmount              |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Line of Credit Facility, Current Borrowing Capacity                                                               | 11,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity  |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Line of Credit Facility, Remaining Borrowing Capacity                                                             | 7,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Purchase commitments                                                                                              | 154,000,000us-gaap_PurchaseObligation                           |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Long Term Purchase Commitment Cancellation Fees                                                                   | 39,000,000nav_LongTermPurchaseCommitmentCancellationFees        |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Number of Contaminated Sites                                                                                      | 2nav_NumberOfContaminatedSites                                  |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Number of Contaminated Sites in Sao Paulo, Brazil                                                                 | 2nav_NumberOfContaminatedSitesInSaoPauloBrazil                  |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Accrual for environmental loss contingencies                                                                      | 22,000,000us-gaap_AccrualForEnvironmentalLossContingencies      |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Damages sought, value                                                                                             |                                                            | 3,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_SaoPauloGroundwaterNoticeMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_SanctionsMember | 1,100,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_SaoPauloGroundwaterNoticeMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_SanctionsMember | 24,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_InternationalChamberofCommerceMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_PenaltiesandInterestMember | 64,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_InternationalChamberofCommerceMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_PenaltiesandInterestMember | 48,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_NavitrucksMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_AllegedUnfulfilledPromisesandInjurytoReputationMember | 128,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_NavitrucksMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_AllegedUnfulfilledPromisesandInjurytoReputationMember | 66,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_NavitrucksMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_AllegedUnfulfilledPromisesandInjurytoReputationMember | 178,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_NavitrucksMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_AllegedUnfulfilledPromisesandInjurytoReputationMember |                                                                                                                                   |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   | 50,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= us-gaap_DisputesMember/ us-gaap_LitigationStatusAxis= us-gaap_PendingLitigationMember | 1,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_FatmaNoticeTrialMember/ us-gaap_LitigationStatusAxis= us-gaap_PendingLitigationMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_PenaltiesMember | 2,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_FatmaNoticeTrialMember/ us-gaap_LitigationStatusAxis= us-gaap_PendingLitigationMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_PenaltiesMember |
| Notice of Violation, number                                                                                       |                                                            |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                | 7,600nav_NoticeOfViolationNumberOfEngines/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_DamagesFromProductDefectsMember |                                                                                                                            |                                                                                                                          |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Regulatory Penalty                                                                                                |                                                            |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                |                                                                                                                                   | $ 2,500,000nav_RegulatoryPenalty/ us-gaap_LossContingenciesByNatureOfContingencyAxis= nav_CaliforniaAirResourcesBoardCarbMember | $ 300,000nav_RegulatoryPenalty/ us-gaap_LossContingenciesByNatureOfContingencyAxis= nav_CaliforniaAirResourcesBoardCarbMember |                                                                                                                                  |                                                                                                                                  |   |   |   |   |   |   |   |   |   |

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Equipment leased to others
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Historic Losses On Finance Receivables Measured As Percentage Of Average Balance Of Related Finance Receivable
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No definition available.
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Long Term Purchase Commitment Cancellation Fees
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Loss Sharing Agreement, Percentage
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| X                                                                                                                                                                                                                                                      |
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Notice of Violation, number of engines
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| - Definition
Number of Contaminated Sites
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| - Definition
Number of Contaminated Sites in Sao Paulo, Brazil
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| X                                                                                                                                                                                                                                                           |
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| - Definition
Off Balance Sheet Finance Receivables1
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| - Definition
Off Balance Sheet Finance Receivables Related Originations1
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| - Definition
Operating Agreement Excess Loss Percentage
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| - Definition
Regulatory Penalty
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total costs accrued as of the balance sheet date for environmental loss contingencies.
+ References
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| - Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The value (monetary amount) of the award the plaintiff seeks in the legal matter.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.
+ References
No definition available.
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