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Fair Value Measurements - Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset impairment charges $ 1us-gaap_AssetImpairmentCharges $ 151us-gaap_AssetImpairmentCharges $ 8us-gaap_AssetImpairmentCharges $ 169us-gaap_AssetImpairmentCharges    
Goodwill 38us-gaap_Goodwill   38us-gaap_Goodwill     38us-gaap_Goodwill
Cash and Cash Equivalents, Maturity Term     90 days      
Marketable Securities, Maturity Term     90 days      
Brazilian Reporting Unit [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Goodwill, Impairment Loss 0us-gaap_GoodwillImpairmentLoss
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
142us-gaap_GoodwillImpairmentLoss
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
0us-gaap_GoodwillImpairmentLoss
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
142us-gaap_GoodwillImpairmentLoss
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
   
Indefinite-Lived Intangible Assets (Excluding Goodwill)   43us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
  43us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
   
Asset impairment charges   149us-gaap_AssetImpairmentCharges
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
       
Goodwill   142us-gaap_Goodwill
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
  142us-gaap_Goodwill
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
   
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
7us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
7us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ nav_ReportingUnitAxis
= nav_BrazilianReportingUnitMember
   
North America Truck [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Asset impairment charges         $ 18us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= nav_NorthAmericaTruckMember