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

Name:	us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nav_FinanceReceivableNonAccrualStatusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nav_ImpairedFinanceReceivablesWithSpecificLossReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nav_ImpairedFinancingReceivableWithoutSpecificLossReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nav_SpecificLossReservesOnImpairedFinanceReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: