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Income Taxes - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Oct. 31, 2014
Apr. 30, 2014
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Operating Loss Carryforwards [Line Items]          
Unrecognized Tax Benefits that Would Not Impact Effective Tax Rate $ 4nav_UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate   $ 4nav_UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate    
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 870us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic   870us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic    
Income Tax Expense (Benefit)     26us-gaap_IncomeTaxExpenseBenefit (171)us-gaap_IncomeTaxExpenseBenefit 1,780us-gaap_IncomeTaxExpenseBenefit
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (16)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 29us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 234us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 350us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 2,200us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Undistributed Earnings of Foreign Subsidiaries 469us-gaap_UndistributedEarningsOfForeignSubsidiaries   469us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 144us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal   144us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal    
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 199us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign   199us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign    
Deferred Tax Assets, Operating Loss Carryforwards 1,213us-gaap_DeferredTaxAssetsOperatingLossCarryforwards   1,213us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 840us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Deferred Tax Assets, Valuation Allowance 3,174us-gaap_DeferredTaxAssetsValuationAllowance   3,174us-gaap_DeferredTaxAssetsValuationAllowance 2,773us-gaap_DeferredTaxAssetsValuationAllowance  
Income Taxes Percent Likelihood Of Being Realized Upon Settlement 50.00%nav_IncomeTaxesPercentLikelihoodOfBeingRealizedUponSettlement   50.00%nav_IncomeTaxesPercentLikelihoodOfBeingRealizedUponSettlement    
Unrecognized Tax Benefits 47us-gaap_UnrecognizedTaxBenefits   47us-gaap_UnrecognizedTaxBenefits 88us-gaap_UnrecognizedTaxBenefits  
offsetting tax benefits associated with the correlative effects of potential transfer pricing adjustments 12nav_OffsettingTaxBenefitsAssociatedWithCorrelativeEffectsOfPotentialTransferPricingAdjustments   12nav_OffsettingTaxBenefitsAssociatedWithCorrelativeEffectsOfPotentialTransferPricingAdjustments    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense       6us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 11us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 12us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Liability for Uncertain Tax Benefits Time Range     12 days    
Intraperiod Tax Allocation Rule [Member]          
Operating Loss Carryforwards [Line Items]          
Income Tax Expense (Benefit)       (220)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= nav_IntraperiodTaxAllocationRuleMember		  
Domestic Tax Authority [Member]          
Operating Loss Carryforwards [Line Items]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount         (189)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
Other Comprehensive Income (Loss) [Member]          
Operating Loss Carryforwards [Line Items]          
Income Tax Expense (Benefit)       (212)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_OtherComprehensiveIncomeMember		  
Additional Paid-in Capital [Member]          
Operating Loss Carryforwards [Line Items]          
Income Tax Expense (Benefit)       (8)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Convertible Subordinated Debt [Member]          
Operating Loss Carryforwards [Line Items]          
Income Tax Expense (Benefit)   (13)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleSubordinatedDebtMember		      
Stock Option Tax Benefits [Member]          
Operating Loss Carryforwards [Line Items]          
Deferred Tax Assets, Operating Loss Carryforwards $ 62us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ nav_OperatingLossCarryforwardsAxis
= nav_StockOptionTaxBenefitsMember		   $ 62us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ nav_OperatingLossCarryforwardsAxis
= nav_StockOptionTaxBenefitsMember		    
Minimum [Member]          
Operating Loss Carryforwards [Line Items]          
Operating Loss Carryforwards, Duration of Carryforward     5 years    
Maximum [Member]          
Operating Loss Carryforwards [Line Items]          
Operating Loss Carryforwards, Duration of Carryforward     20 years