| **Segment Reporting - Summary of Segment Operations (Details) (USD $)In Millions, unless otherwise specified**                                                                                                                         | 3 Months Ended                                                                                                    | 12 Months Ended       |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------|-----------------------|
||
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                         |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| External sales and revenues, net                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | $ 10,806nav_Externalsalesandrevenuesnet |  | $ 10,775nav_Externalsalesandrevenuesnet |  | $ 12,695nav_Externalsalesandrevenuesnet |  |
| Intersegment sales and revenues                                                                                                                                                                                                        |                                                                                                              |                  |   |   |   |   |   |   | 0nav_Intersegmentsalesandrevenues |  | 0nav_Intersegmentsalesandrevenues |  | 0nav_Intersegmentsalesandrevenues |  |
| Sales and revenues, net                                                                                                                                                                                                                | 3,008us-gaap_Revenues                                                                                             | 2,844us-gaap_Revenues | 2,746us-gaap_Revenues | 2,208us-gaap_Revenues | 2,751us-gaap_Revenues | 2,861us-gaap_Revenues | 2,526us-gaap_Revenues | 2,637us-gaap_Revenues | 10,806us-gaap_Revenues |  | 10,775us-gaap_Revenues |  | 12,695us-gaap_Revenues |  |
| Loss from continuing operations, net of tax                                                                                                                                                                                            |                                                                                                              |                  |   |   |   |   |   |   | (622)us-gaap_IncomeLossFromContinuingOperations |  | (857)us-gaap_IncomeLossFromContinuingOperations |  | (2,939)us-gaap_IncomeLossFromContinuingOperations |  |
| Income tax expense                                                                                                                                                                                                                     |                                                                                                              |                  |   |   |   |   |   |   | (26)us-gaap_IncomeTaxExpenseBenefit |  | 171us-gaap_IncomeTaxExpenseBenefit |  | (1,780)us-gaap_IncomeTaxExpenseBenefit |  |
| Segment Profit Loss                                                                                                                                                                                                                    |                                                                                                              |                  |   |   |   |   |   |   | (596)nav_SegmentProfitLoss |  | (1,028)nav_SegmentProfitLoss |  | (1,159)nav_SegmentProfitLoss |  |
| Depreciation and amortization                                                                                                                                                                                                          |                                                                                                              |                  |   |   |   |   |   |   | 332us-gaap_DepreciationDepletionAndAmortization |  | 417us-gaap_DepreciationDepletionAndAmortization |  | 323us-gaap_DepreciationDepletionAndAmortization |  |
| Interest expense                                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 314us-gaap_InterestExpense |  | 321us-gaap_InterestExpense |  | 259us-gaap_InterestExpense |  |
| Equity in income (loss) of non-consolidated affiliates                                                                                                                                                                                 |                                                                                                              |                  |   |   |   |   |   |   | 9us-gaap_IncomeLossFromEquityMethodInvestments |  | 11us-gaap_IncomeLossFromEquityMethodInvestments |  | (29)us-gaap_IncomeLossFromEquityMethodInvestments |  |
| Capital expenditures                                                                                                                                                                                                                   |                                                                                                              |                  |   |   |   |   |   |   | 88us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [1] | 167us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [1] | 309us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [1] |
| North America Truck [Member]                                                                                                                                                                                                           |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                         |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| External sales and revenues, net                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 6,660nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 6,312nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 7,946nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  |
| Intersegment sales and revenues                                                                                                                                                                                                        |                                                                                                              |                  |   |   |   |   |   |   | 420nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 486nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 442nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  |
| Sales and revenues, net                                                                                                                                                                                                                |                                                                                                              |                  |   |   |   |   |   |   | 7,080us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 6,798us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 8,388us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  |
| Loss from continuing operations, net of tax                                                                                                                                                                                            |                                                                                                              |                  |   |   |   |   |   |   | (408)us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | (902)us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | (736)us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  |
| Income tax expense                                                                                                                                                                                                                     |                                                                                                              |                  |   |   |   |   |   |   | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  |
| Segment Profit Loss                                                                                                                                                                                                                    |                                                                                                              |                  |   |   |   |   |   |   | (408)nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | (902)nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | (736)nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  |
| Depreciation and amortization                                                                                                                                                                                                          |                                                                                                              |                  |   |   |   |   |   |   | 212us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 305us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 216us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  |
| Interest expense                                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 0us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 0us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 0us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  |
| Equity in income (loss) of non-consolidated affiliates                                                                                                                                                                                 |                                                                                                              |                  |   |   |   |   |   |   | 5us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | 10us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  | (1)us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember |  |
| Capital expenditures                                                                                                                                                                                                                   |                                                                                                              |                  |   |   |   |   |   |   | 65us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember | [1] | 142us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember | [1] | 173us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaTruckMember | [1] |
| North America Parts [Member]                                                                                                                                                                                                           |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                         |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| External sales and revenues, net                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 2,471nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 2,558nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 2,497nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  |
| Intersegment sales and revenues                                                                                                                                                                                                        |                                                                                                              |                  |   |   |   |   |   |   | 46nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 57nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 124nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  |
| Sales and revenues, net                                                                                                                                                                                                                |                                                                                                              |                  |   |   |   |   |   |   | 2,517us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 2,615us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 2,621us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  |
| Loss from continuing operations, net of tax                                                                                                                                                                                            |                                                                                                              |                  |   |   |   |   |   |   | 500us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 476us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 343us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  |
| Income tax expense                                                                                                                                                                                                                     |                                                                                                              |                  |   |   |   |   |   |   | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  |
| Segment Profit Loss                                                                                                                                                                                                                    |                                                                                                              |                  |   |   |   |   |   |   | 500nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 476nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 343nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  |
| Depreciation and amortization                                                                                                                                                                                                          |                                                                                                              |                  |   |   |   |   |   |   | 15us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 17us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 16us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  |
| Interest expense                                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 0us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 0us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 0us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  |
| Equity in income (loss) of non-consolidated affiliates                                                                                                                                                                                 |                                                                                                              |                  |   |   |   |   |   |   | 4us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 6us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  | 5us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember |  |
| Capital expenditures                                                                                                                                                                                                                   |                                                                                                              |                  |   |   |   |   |   |   | 6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember | [1] | 2us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember | [1] | 21us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_NorthAmericaPartsMember | [1] |
| Global Operations [Member]                                                                                                                                                                                                             |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                         |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| External sales and revenues, net                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 1,522nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 1,747nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 2,084nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  |
| Intersegment sales and revenues                                                                                                                                                                                                        |                                                                                                              |                  |   |   |   |   |   |   | 35nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 78nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 126nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  |
| Sales and revenues, net                                                                                                                                                                                                                |                                                                                                              |                  |   |   |   |   |   |   | 1,557us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 1,825us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 2,210us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  |
| Loss from continuing operations, net of tax                                                                                                                                                                                            |                                                                                                              |                  |   |   |   |   |   |   | (218)us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | (6)us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | (168)us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  |
| Income tax expense                                                                                                                                                                                                                     |                                                                                                              |                  |   |   |   |   |   |   | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  |
| Segment Profit Loss                                                                                                                                                                                                                    |                                                                                                              |                  |   |   |   |   |   |   | (218)nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | (6)nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | (168)nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  |
| Depreciation and amortization                                                                                                                                                                                                          |                                                                                                              |                  |   |   |   |   |   |   | 32us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 32us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 36us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  |
| Interest expense                                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 0us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 0us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | 0us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  |
| Equity in income (loss) of non-consolidated affiliates                                                                                                                                                                                 |                                                                                                              |                  |   |   |   |   |   |   | 0us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | (5)us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  | (33)us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember |  |
| Capital expenditures                                                                                                                                                                                                                   |                                                                                                              |                  |   |   |   |   |   |   | 8us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember | [1] | 9us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember | [1] | 50us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_GlobalOperationsMember | [1] |
| Financial Services Operations [Member]                                                                                                                                                                                                 |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                         |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| External sales and revenues, net                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 153nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 158nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 168nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] |
| Intersegment sales and revenues                                                                                                                                                                                                        |                                                                                                              |                  |   |   |   |   |   |   | 79nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 75nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 91nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] |
| Sales and revenues, net                                                                                                                                                                                                                |                                                                                                              |                  |   |   |   |   |   |   | 232us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 233us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 259us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] |
| Loss from continuing operations, net of tax                                                                                                                                                                                            |                                                                                                              |                  |   |   |   |   |   |   | 97us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 81us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 91us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] |
| Income tax expense                                                                                                                                                                                                                     |                                                                                                              |                  |   |   |   |   |   |   | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 0us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] |
| Segment Profit Loss                                                                                                                                                                                                                    |                                                                                                              |                  |   |   |   |   |   |   | 97nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 81nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 91nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] |
| Depreciation and amortization                                                                                                                                                                                                          |                                                                                                              |                  |   |   |   |   |   |   | 46us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 40us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 33us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] |
| Interest expense                                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 71us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 70us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 88us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] |
| Equity in income (loss) of non-consolidated affiliates                                                                                                                                                                                 |                                                                                                              |                  |   |   |   |   |   |   | 0us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 0us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] | 0us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [2] |
| Capital expenditures                                                                                                                                                                                                                   |                                                                                                              |                  |   |   |   |   |   |   | 1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [1],[2] | 2us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [1],[2] | 3us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember | [1],[2] |
| Investment Income, Interest                                                                                                                                                                                                            | 170us-gaap_InvestmentIncomeInterest/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember |                  |   |   | 254us-gaap_InvestmentIncomeInterest/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember |   |   |   | 181us-gaap_InvestmentIncomeInterest/ us-gaap_StatementBusinessSegmentsAxis= nav_FinancialServicesOperationsMember |  |   |  |   |  |
| Corporate And Eliminations [Member]                                                                                                                                                                                                    |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                         |                                                                                                              |                  |   |   |   |   |   |   |   |  |   |  |   |  |
| External sales and revenues, net                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 0nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | 0nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | 0nav_Externalsalesandrevenuesnet/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  |
| Intersegment sales and revenues                                                                                                                                                                                                        |                                                                                                              |                  |   |   |   |   |   |   | (580)nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | (696)nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | (783)nav_Intersegmentsalesandrevenues/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  |
| Sales and revenues, net                                                                                                                                                                                                                |                                                                                                              |                  |   |   |   |   |   |   | (580)us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | (696)us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | (783)us-gaap_Revenues/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  |
| Loss from continuing operations, net of tax                                                                                                                                                                                            |                                                                                                              |                  |   |   |   |   |   |   | (593)us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | (506)us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | (2,469)us-gaap_IncomeLossFromContinuingOperations/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  |
| Income tax expense                                                                                                                                                                                                                     |                                                                                                              |                  |   |   |   |   |   |   | (26)us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | 171us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | (1,780)us-gaap_IncomeTaxExpenseBenefit/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  |
| Segment Profit Loss                                                                                                                                                                                                                    |                                                                                                              |                  |   |   |   |   |   |   | (567)nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | (677)nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | (689)nav_SegmentProfitLoss/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  |
| Depreciation and amortization                                                                                                                                                                                                          |                                                                                                              |                  |   |   |   |   |   |   | 27us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | 23us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | 22us-gaap_DepreciationDepletionAndAmortization/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  |
| Interest expense                                                                                                                                                                                                                       |                                                                                                              |                  |   |   |   |   |   |   | 243us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | 251us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | 171us-gaap_InterestExpense/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  |
| Equity in income (loss) of non-consolidated affiliates                                                                                                                                                                                 |                                                                                                              |                  |   |   |   |   |   |   | 0us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | 0us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  | 0us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember |  |
| Capital expenditures                                                                                                                                                                                                                   |                                                                                                              |                  |   |   |   |   |   |   | $ 8us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember | [1] | $ 12us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember | [1] | $ 62us-gaap_PaymentsToAcquirePropertyPlantAndEquipment/ us-gaap_StatementBusinessSegmentsAxis= nav_CorporateAndEliminationsMember | [1] |
|                                                                                                                                                                                                                                        |
| [1]Exclusive of purchases of equipment leased to others.[2](A)Total sales and revenues in the Financial Services segment include interest revenues of $170 million, $181 million, and $254 million for 2014, 2013, 2012, respectively. |

| X                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
External sales and revenues, net
+ References
No definition available.
+ Details**Name:**nav_Externalsalesandrevenuesnet**Namespace Prefix:**nav_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Intersegment sales and revenues
+ References
No definition available.
+ Details**Name:**nav_Intersegmentsalesandrevenues**Namespace Prefix:**nav_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of profit or loss recognized by the reportable segment.
+ References
No definition available.
+ Details**Name:**nav_SegmentProfitLoss**Namespace Prefix:**nav_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585
+ Details**Name:**us-gaap_DepreciationDepletionAndAmortization**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688
+ Details**Name:**us-gaap_IncomeLossFromContinuingOperations**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7
+ Details**Name:**us-gaap_IncomeLossFromEquityMethodInvestments**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319
+ Details**Name:**us-gaap_IncomeTaxExpenseBenefit**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9
+ Details**Name:**us-gaap_InterestExpense**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688
+ Details**Name:**us-gaap_InvestmentIncomeInterest**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585
+ Details**Name:**us-gaap_PaymentsToAcquirePropertyPlantAndEquipment**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5
+ Details**Name:**us-gaap_Revenues**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SegmentReportingInformationLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=nav_CorporateAndEliminationsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=nav_FinancialServicesOperationsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=nav_GlobalOperationsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=nav_NorthAmericaPartsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=nav_NorthAmericaTruckMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |