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Segment Information (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Segment Reporting, Change in Measurement Method   $ 19car_SegmentReportingChangeinMeasurementMethod
Sales Revenue, Services, Net 1,850us-gaap_SalesRevenueServicesNet 1,862us-gaap_SalesRevenueServicesNet
Adjusted EBITDA 117car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization 117car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization
Non Vehicle Related Depreciation And Amortization 49car_NonVehicleRelatedDepreciationAndAmortization 41car_NonVehicleRelatedDepreciationAndAmortization
Restructuring expense 1us-gaap_RestructuringCharges 7us-gaap_RestructuringCharges
Loss before income taxes (16)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
International    
Segment Reporting Information [Line Items]    
Segment Reporting, Change in Measurement Method   3car_SegmentReportingChangeinMeasurementMethod
/ us-gaap_StatementBusinessSegmentsAxis
= car_InternationalMember
Sales Revenue, Services, Net 475us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= car_InternationalMember
532us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= car_InternationalMember
Adjusted EBITDA 16car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= car_InternationalMember
14car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= car_InternationalMember
Americas    
Segment Reporting Information [Line Items]    
Sales Revenue, Services, Net 1,375us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AmericasMember
1,330us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AmericasMember
Adjusted EBITDA 115car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AmericasMember
115car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AmericasMember
Corporate and Other [Member]    
Segment Reporting Information [Line Items]    
Sales Revenue, Services, Net 0us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Adjusted EBITDA $ (14)car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ (12)car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember