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Deferred Income Tax Assets And Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Income Tax Assets and Liabilities Additional Information (Detail) [Abstract]    
Deferred Tax Assets, Valuation Allowance $ 319us-gaap_DeferredTaxAssetsValuationAllowance $ 347us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 46us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 46us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Deferred Tax Assets Operating Loss Carryforward With Valuation Against It 249car_DeferredTaxAssetsOperatingLossCarryforwardWithValuationAgainstIt 279car_DeferredTaxAssetsOperatingLossCarryforwardWithValuationAgainstIt
Deferred Tax Assets State And Local 24car_DeferredTaxAssetsStateAndLocal 22car_DeferredTaxAssetsStateAndLocal
Deferred Income Tax Assets And Liabilities [Line Items]    
Accrued liabilities and deferred income 188car_DeferredTaxAssetsAccruedLiabilitiesAndDeferredIncomeCurrent 209car_DeferredTaxAssetsAccruedLiabilitiesAndDeferredIncomeCurrent
Provision for doubtful accounts 7us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 12us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Acquisition and integration-related liabilities 6car_DeferredTaxAssetsAcquisitionAndIntegrationRelatedLiabilitiesCurrent 10car_DeferredTaxAssetsAcquisitionAndIntegrationRelatedLiabilitiesCurrent
Deferred Tax Assets, Hedging Transactions 1us-gaap_DeferredTaxAssetsHedgingTransactions 0us-gaap_DeferredTaxAssetsHedgingTransactions
Convertible note hedge 0car_DeferredTaxAssetsConvertibleNoteHedgeCurrent 1car_DeferredTaxAssetsConvertibleNoteHedgeCurrent
Valuation allowance (22)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (28)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Current deferred income tax assets 180us-gaap_DeferredTaxAssetsNetCurrent 204us-gaap_DeferredTaxAssetsNetCurrent
Accrued liabilities and deferred income 0car_DeferredTaxLiabilitiesAccruedLiabilitiesAndDeferredIncomeCurrent 5car_DeferredTaxLiabilitiesAccruedLiabilitiesAndDeferredIncomeCurrent
Prepaid expenses 21car_DeferredTaxLiabilitiesPrepaidExpensesCurrent 22car_DeferredTaxLiabilitiesPrepaidExpensesCurrent
Current deferred income tax liabilities 21us-gaap_DeferredTaxLiabilitiesCurrent 27us-gaap_DeferredTaxLiabilitiesCurrent
Current net deferred income tax assets 159us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 177us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Net tax loss carryforwards 1,483us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 1,431us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accrued liabilities and deferred income 109car_DeferredTaxAssetsAccruedLiabilitiesAndDeferredIncomeNonCurrent 137car_DeferredTaxAssetsAccruedLiabilitiesAndDeferredIncomeNonCurrent
Depreciation and amortization 23car_DeferredTaxAssetsDepreciationAndAmortizationNonCurrent 15car_DeferredTaxAssetsDepreciationAndAmortizationNonCurrent
Tax credits 75us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 75us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Acquisition and integration-related liabilities 2car_DeferredTaxAssetsAcquisitionAndIntegrationRelatedLiabilitiesNonCurrent 16car_DeferredTaxAssetsAcquisitionAndIntegrationRelatedLiabilitiesNonCurrent
Other 57us-gaap_DeferredTaxAssetsOther 46us-gaap_DeferredTaxAssetsOther
Valuation allowance (297)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (319)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Non-current deferred income tax assets 1,452car_DeferredTaxAssetsNoncurrent 1,401car_DeferredTaxAssetsNoncurrent
Depreciation and amortization 96car_DeferredTaxLiabilitiesDepreciationAndAmortizationNonCurrent 101car_DeferredTaxLiabilitiesDepreciationAndAmortizationNonCurrent
Other 4us-gaap_DeferredTaxLiabilitiesOther 1us-gaap_DeferredTaxLiabilitiesOther
Non-current deferred income tax liabilities 100us-gaap_DeferredTaxLiabilitiesNoncurrent 102us-gaap_DeferredTaxLiabilitiesNoncurrent
Non-current net deferred income tax assets 1,352us-gaap_DeferredTaxAssetsNetNoncurrent 1,299us-gaap_DeferredTaxAssetsNetNoncurrent
Vehicle Programs    
Deferred Income Tax Assets And Liabilities [Line Items]    
Depreciation and amortization 54car_DeferredTaxAssetsDepreciationAndAmortization
/ car_VehicleRepurchaseAndGuaranteedDepreciationProgramsAxis
= car_VehicleProgramsMember		 51car_DeferredTaxAssetsDepreciationAndAmortization
/ car_VehicleRepurchaseAndGuaranteedDepreciationProgramsAxis
= car_VehicleProgramsMember
Deferred income tax assets 54us-gaap_DeferredTaxAssetsNet
/ car_VehicleRepurchaseAndGuaranteedDepreciationProgramsAxis
= car_VehicleProgramsMember		 51us-gaap_DeferredTaxAssetsNet
/ car_VehicleRepurchaseAndGuaranteedDepreciationProgramsAxis
= car_VehicleProgramsMember
Depreciation and amortization 2,321car_DeferredTaxLiabilitiesDepreciationAndAmortization
/ car_VehicleRepurchaseAndGuaranteedDepreciationProgramsAxis
= car_VehicleProgramsMember		 2,228car_DeferredTaxLiabilitiesDepreciationAndAmortization
/ car_VehicleRepurchaseAndGuaranteedDepreciationProgramsAxis
= car_VehicleProgramsMember
Deferred income tax liabilities 2,321us-gaap_DeferredTaxLiabilities
/ car_VehicleRepurchaseAndGuaranteedDepreciationProgramsAxis
= car_VehicleProgramsMember		 2,228us-gaap_DeferredTaxLiabilities
/ car_VehicleRepurchaseAndGuaranteedDepreciationProgramsAxis
= car_VehicleProgramsMember
Net deferred income tax liabilities under vehicle programs $ 2,267us-gaap_DeferredTaxAssetsLiabilitiesNet
/ car_VehicleRepurchaseAndGuaranteedDepreciationProgramsAxis
= car_VehicleProgramsMember		 $ 2,177us-gaap_DeferredTaxAssetsLiabilitiesNet
/ car_VehicleRepurchaseAndGuaranteedDepreciationProgramsAxis
= car_VehicleProgramsMember