| **Commitments and Contingencies - Narrative (Details)**                                                           | 3 Months Ended                                 | 12 Months Ended                                                 |                                        | 1 Months Ended                                                                                                                                                                                                             | 3 Months Ended                                                                                                                                                                                                             | 12 Months Ended                                                                                                                      | 3 Months Ended                                                                                                                        | 12 Months Ended                                                                                                                                                                                                                   | 0 Months Ended                                                                                                                                                                                                                                                                                         | 1 Months Ended                                                                                                                                                                                                                                                                                         | 3 Months Ended                                                                                                                                                                                                                                    | 12 Months Ended                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                            |                                                                                                                                                                                                                                             | 3 Months Ended                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                                         | 12 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                   | $ 1,400,000,000nav_OffBalanceSheetFinanceReceivables/ us-gaap_TypeOfArrangementAxis= nav_GEOperatingAgreementMember |   |   |   |   |   |   |   |   |
| Off Balance Sheet Finance Receivables Related Originations                                                        |                                           |                                                            |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            | 2,300,000,000nav_OffBalanceSheetFinanceReceivablesRelatedOriginations1/ us-gaap_TypeOfArrangementAxis= nav_GEOperatingAgreementMember | 2,000,000,000nav_OffBalanceSheetFinanceReceivablesRelatedOriginations1/ us-gaap_TypeOfArrangementAxis= nav_GEOperatingAgreementMember |   |   |   |   |   |   |   |   |
| Equipment leased to others                                                                                        |                                           | 677,000,000nav_Equipmentleasedtoothers                          | 663,000,000nav_Equipmentleasedtoothers |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   | 156,000,000nav_Equipmentleasedtoothers/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis= nav_GEOperatingAgreementMember |   |   |   |   |   |
| Long-term Debt                                                                                                    |                                           | 5,224,000,000us-gaap_LongTermDebt                               |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   | 2,958,000,000us-gaap_LongTermDebt/ us-gaap_StatementBusinessSegmentsAxis= nav_ManufacturingOperationsMember | 184,000,000us-gaap_LongTermDebt/ us-gaap_LongtermDebtTypeAxis= nav_FinancedLeaseObligationsMember/ us-gaap_StatementBusinessSegmentsAxis= nav_ManufacturingOperationsMember | 218,000,000us-gaap_LongTermDebt/ us-gaap_LongtermDebtTypeAxis= nav_FinancedLeaseObligationsMember/ us-gaap_StatementBusinessSegmentsAxis= nav_ManufacturingOperationsMember | 181,000,000us-gaap_LongTermDebt/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis= nav_GEOperatingAgreementMember/ us-gaap_LongtermDebtTypeAxis= nav_FinancedLeaseObligationsMember/ us-gaap_StatementBusinessSegmentsAxis= nav_ManufacturingOperationsMember | 167,000,000us-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                                                             |                                           | 90,000,000us-gaap_LettersOfCreditOutstandingAmount              |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Line of Credit Facility, Current Borrowing Capacity                                                               |                                           | 13,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity  |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Line of Credit Facility, Remaining Borrowing Capacity                                                             |                                           | 9,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Purchase commitments                                                                                              |                                           | 154,000,000us-gaap_PurchaseObligation                           |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Long Term Purchase Commitment Cancellation Fees                                                                   |                                           | 41,000,000nav_LongTermPurchaseCommitmentCancellationFees        |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Number of Contaminated Sites                                                                                      |                                           | 2nav_NumberOfContaminatedSites                                  |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Number of Contaminated Sites in Sao Paulo, Brazil                                                                 |                                           | 2nav_NumberOfContaminatedSitesInSaoPauloBrazil                  |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Accrual for environmental loss contingencies                                                                      |                                           | 21,000,000us-gaap_AccrualForEnvironmentalLossContingencies      |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Damages sought, value                                                                                             |                                           |                                                            |                                   | 3,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_SaoPauloGroundwaterNoticeMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_SanctionsMember | 1,200,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_SaoPauloGroundwaterNoticeMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_SanctionsMember |                                                                                                                                 |                                                                                                                                  | 50,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= us-gaap_DisputesMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember | 1,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_FatmaNoticeTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_PenaltiesMember | 2,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_FatmaNoticeTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_PenaltiesMember | 10,850,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember | 25,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember | 22,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        | 3,500,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember | 42,000,000us-gaap_LossContingencyDamagesSoughtValue/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_RoyaltiesMember     |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Loss Contingency, Loss in Period                                                                                  |                                           |                                                            |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              | 8,500,000us-gaap_LossContingencyLossInPeriod/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember | 20,000,000us-gaap_LossContingencyLossInPeriod/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember | 8,200,000us-gaap_LossContingencyLossInPeriod/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember       |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Estimate of possible loss                                                                                         |                                           |                                                            |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             | 16,000,000us-gaap_LossContingencyEstimateOfPossibleLoss/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_RoyaltiesMember | 74,000,000us-gaap_LossContingencyEstimateOfPossibleLoss/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_RoyaltiesMember | 70,000,000us-gaap_LossContingencyEstimateOfPossibleLoss/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_LisFrancoVsSyntexAndMwmTrialMember/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_PendingLitigationMember/ nav_LossContingencyByTypeOfPossibleLossAxis= nav_RoyaltiesMember |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Proceeds from Legal Settlements                                                                                   | 35,000,000us-gaap_ProceedsFromLegalSettlements |                                                            |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Notice of Violation, number                                                                                       |                                           |                                                            |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |                                                                                                                                 |                                                                                                                                  |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    | 7,600nav_NoticeOfViolationNumberOfEngines/ us-gaap_LossContingenciesByNatureOfContingencyAxis= us-gaap_DamagesFromProductDefectsMember |                                                                                                                            |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |
| Regulatory Penalty                                                                                                |                                           |                                                            |                                   |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       | $ 2,000,000nav_RegulatoryPenalty/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_NonConformancePenaltiesMember | $ 36,000,000nav_RegulatoryPenalty/ nav_ContingencyDisclosureRelatedToLitigationByTrialOrRulingAxis= nav_NonConformancePenaltiesMember |                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                    |                                                                                                                                   | $ 2,500,000nav_RegulatoryPenalty/ us-gaap_LossContingenciesByNatureOfContingencyAxis= nav_CaliforniaAirResourcesBoardCarbMember |                                                                                                            |                                                                                                                                  |   |   |   |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equipment leased to others
+ References
No definition available.
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| - Definition
Historic Losses On Finance Receivables Measured As Percentage Of Average Balance Of Related Finance Receivable
+ References
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| - Definition
Long Term Purchase Commitment Cancellation Fees
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| - Definition
Loss Sharing Agreement, Percentage
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| - Definition
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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| - 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
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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
Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.
+ References
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| - Definition
The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.
+ References
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| - Definition
Cash received for the settlement of litigation during the current period.
+ 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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