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Segment Reporting - Summary of Segment Assets (Details) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2015
Oct. 31, 2014
Segment Reporting Information [Line Items]    
Segment Assets $ 6,925us-gaap_Assets $ 7,443us-gaap_Assets
North America Truck [Member]    
Segment Reporting Information [Line Items]    
Segment Assets 2,104us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nav_NorthAmericaTruckMember		 2,245us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nav_NorthAmericaTruckMember
North America Parts [Member]    
Segment Reporting Information [Line Items]    
Segment Assets 669us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nav_NorthAmericaPartsMember		 672us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nav_NorthAmericaPartsMember
Global Operations [Member]    
Segment Reporting Information [Line Items]    
Segment Assets 514us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nav_GlobalOperationsMember		 657us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nav_GlobalOperationsMember
Financial Services Operations [Member]    
Segment Reporting Information [Line Items]    
Segment Assets 2,611us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nav_FinancialServicesOperationsMember		 2,598us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nav_FinancialServicesOperationsMember
Corporate And Eliminations [Member]    
Segment Reporting Information [Line Items]    
Segment Assets $ 1,027us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nav_CorporateAndEliminationsMember		 $ 1,271us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nav_CorporateAndEliminationsMember