| **Allowance for Doubtful Accounts - Schedule of Allowance for Retail, Wholesale, Trade & Other (Details) (USD $)**                                                                                                                                                                                                                                               | 12 Months Ended                                                                                                                                              |
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| **Allowance for Doubtful Accounts Receivable [Roll Forward]**                                                                                                                                                                                                                                                                                                        |                                                                                                                                                         |  |   |  |   |  |
| Allowance for doubtful accounts at beginning of period                                                                                                                                                                                                                                                                                                               | $ 60,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses                                                                                              |  | $ 51,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses |  | $ 50,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses |  |
| Provision for doubtful accounts, net of recoveries                                                                                                                                                                                                                                                                                                                   | 20,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses                                                                                                        | [1] | 20,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses | [1] | 14,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses | [1] |
| Charge-off of accounts                                                                                                                                                                                                                                                                                                                                               | (15,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs                                                                                     | [2] | (11,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | [2] | (13,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | [2] |
| Allowance for doubtful accounts at end of period                                                                                                                                                                                                                                                                                                                     | 65,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses                                                                                                |  | 60,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses |  | 51,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses |  |
| Loss on Contract Termination for Default                                                                                                                                                                                                                                                                                                                             | 1,000,000us-gaap_LossOnContractTerminationForDefault                                                                                                         |  | 2,000,000us-gaap_LossOnContractTerminationForDefault |  | 6,000,000us-gaap_LossOnContractTerminationForDefault |  |
| Retail Portfolio [Member]                                                                                                                                                                                                                                                                                                                                            |                                                                                                                                                         |  |   |  |   |  |
| **Allowance for Doubtful Accounts Receivable [Roll Forward]**                                                                                                                                                                                                                                                                                                        |                                                                                                                                                         |  |   |  |   |  |
| Allowance for doubtful accounts at beginning of period                                                                                                                                                                                                                                                                                                               | 21,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember                    |  | 27,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember |  | 31,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember |  |
| Provision for doubtful accounts, net of recoveries                                                                                                                                                                                                                                                                                                                   | 12,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember                            | [1] | 4,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember | [1] | 3,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember | [1] |
| Charge-off of accounts                                                                                                                                                                                                                                                                                                                                               | (9,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember          | [2] | (10,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember | [2] | (7,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember | [2] |
| Allowance for doubtful accounts at end of period                                                                                                                                                                                                                                                                                                                     | 24,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember                    |  | 21,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember |  | 27,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_RetailPortfolioMember |  |
| Wholesale Portfolio [Member]                                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                         |  |   |  |   |  |
| **Allowance for Doubtful Accounts Receivable [Roll Forward]**                                                                                                                                                                                                                                                                                                        |                                                                                                                                                         |  |   |  |   |  |
| Allowance for doubtful accounts at beginning of period                                                                                                                                                                                                                                                                                                               | 2,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember                  |  | 0us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember |  | 2,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember |  |
| Provision for doubtful accounts, net of recoveries                                                                                                                                                                                                                                                                                                                   | 1,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember                          | [1] | 2,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember | [1] | (2,000,000)us-gaap_ProvisionForLoanLeaseAndOtherLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember | [1] |
| Charge-off of accounts                                                                                                                                                                                                                                                                                                                                               | 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember                 | [2] | 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember | [2] | 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember | [2] |
| Allowance for doubtful accounts at end of period                                                                                                                                                                                                                                                                                                                     | 3,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember                  |  | 2,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember |  | 0us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_WholesalePortfolioMember |  |
| Trade and Other Receivables [Member]                                                                                                                                                                                                                                                                                                                                 |                                                                                                                                                         |  |   |  |   |  |
| **Allowance for Doubtful Accounts Receivable [Roll Forward]**                                                                                                                                                                                                                                                                                                        |                                                                                                                                                         |  |   |  |   |  |
| Allowance for doubtful accounts at beginning of period                                                                                                                                                                                                                                                                                                               | 37,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember           |  | 24,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember |  | 17,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember |  |
| Provision for doubtful accounts, net of recoveries                                                                                                                                                                                                                                                                                                                   | 7,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember                    | [1] | 14,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember | [1] | 13,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember | [1] |
| Charge-off of accounts                                                                                                                                                                                                                                                                                                                                               | (6,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember | [2] | (1,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember | [2] | (6,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember | [2] |
| Allowance for doubtful accounts at end of period                                                                                                                                                                                                                                                                                                                     | $ 38,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember         |  | $ 37,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember |  | $ 24,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses/ nav_ReceivableInformationByPortfolioSegmentAxis= nav_TradeAndOtherReceivablesMember |  |
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| [1](A)Amounts include currency translation.[2]We repossess sold and leased vehicles on defaulted finance receivables and leases, and place them into Inventories. Losses recognized at the time of repossession and charged against the allowance for doubtful accounts were less than $1 million, $2 million, and $6 million in 2014, 2013, and 2012, respectively. |

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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| - Definition
A valuation allowance for financing receivables that are expected to be uncollectible.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524
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| - Definition
Amount of direct write-downs of financing receivables charged against the allowance.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524
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| - Definition
The amount of the loss on termination of a contract for default.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6539154&loc=d3e52595-109384
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| - Definition
Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.
+ 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 (a) -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 04 -Paragraph 11 -Article 9Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524
+ Details**Name:**us-gaap_ProvisionForLoanLeaseAndOtherLosses**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
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