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Stockholders' Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2009
Dec. 31, 2014
Stockholders Equity [Line Items]            
Stock Repurchase Program, Authorized Amount   $ 635us-gaap_StockRepurchaseProgramAuthorizedAmount1        
Stock Repurchased During Period, Shares   5,700,000us-gaap_StockRepurchasedDuringPeriodShares 1,600,000us-gaap_StockRepurchasedDuringPeriodShares      
Stock Repurchased During Period, Value   300us-gaap_StockRepurchasedDuringPeriodValue 50us-gaap_StockRepurchasedDuringPeriodValue      
Convertible note hedge purchased, gross         95car_ConvertibleNoteHedgePurchasedGross  
Proceeds from issuance of warrants         62us-gaap_ProceedsFromIssuanceOfWarrants  
Stock Issued During Period, Shares, Conversion of Convertible Securities   4,000,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities        
Common stock subject to anti-dilution provisions         21,200,000car_CommonStockSubjectToAntiDilutionProvisions  
Convertible note hedge strike price         16.25us-gaap_DerivativePriceRiskOptionStrikePrice  
Repurchased warrants for the purchase of the Company's common stock 41us-gaap_PaymentsForRepurchaseOfWarrants 0us-gaap_PaymentsForRepurchaseOfWarrants 78us-gaap_PaymentsForRepurchaseOfWarrants 29us-gaap_PaymentsForRepurchaseOfWarrants    
Proceeds from Derivative Instrument, Financing Activities     50us-gaap_ProceedsFromDerivativeInstrumentFinancingActivities      
Proceeds from sale of convertible note hedge 54us-gaap_ProceedsFromHedgeFinancingActivities 0us-gaap_ProceedsFromHedgeFinancingActivities 104us-gaap_ProceedsFromHedgeFinancingActivities 43us-gaap_ProceedsFromHedgeFinancingActivities    
Adjustments to Treasury Stock, Other (179,000)car_AdjustmentstoTreasuryStockOther          
Adjustment to Treasury Stock, Other (7)car_AdjustmenttoTreasuryStockOther          
Net Unrealized Gains (Losses) on Cash Flow Hedges, Beginning Balance   1us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (13)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax   (1)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax   8us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax   5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax   14us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax   3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 15us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax      
Less: Pension and post-retirement benefits reclassified to earnings, net of tax of $(1), $(6) and $(6), respectively   (2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax (9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax (8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax    
Three And One Over Two Senior Notes [Member]            
Stockholders Equity [Line Items]            
Change in net purchase and issuance of shares   13,000,000car_ChangeInNetPurchaseAndIssuanceOfShares
/ us-gaap_DebtInstrumentAxis
= car_ThreeAndOneOverTwoSeniorNotesMember		        
3 1/2% Convertible Senior Notes            
Stockholders Equity [Line Items]            
Stock Issued During Period, Shares, Conversion of Convertible Securities   4,000,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_DebtInstrumentAxis
= car_ThreeAndOneOverTwoConvertibleSeniorNotesMember		        
Common Stock            
Stockholders Equity [Line Items]            
Repurchased warrants for the purchase of the Company's common stock     37us-gaap_PaymentsForRepurchaseOfWarrants
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		      
Foreign Exchange Forward [Member]            
Stockholders Equity [Line Items]            
Net Unrealized Gains (Losses) on Cash Flow Hedges, Beginning Balance           $ 35us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember