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Stock-Based Compensation (Narrative) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 43.00% 49.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 0.39%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum   0.39%
Valuation Period Range Maximum In Years P3Y P3Y
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 0.00% 0.00%
Stock-based compensation expense $ 4 $ 4
Stock-based compensation expense (net of tax) 3 2
Employee service share based compensation incremental tax benefit to be realized from exercise of stock awards 21  
Restricted Cash Units Outstanding 268,000  
Customer Relationships 78  
Time-based vesting schedule [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of restricted stock units which contain three-year vesting periods $ 21.20  
Market-based vesting schedule [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of restricted stock units which contain three-year vesting periods $ 17.14 $ 10.61
Performance-Based Vesting Schedule [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of restricted stock units which contain three-year vesting periods $ 20.30  
Restricted Cash Units (RCUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average remaining contractual life (in years) 2 years 1 month 6 days  
Restricted Cash Units (RCUs) [Member] | Time-based vesting schedule [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted at fair market value (in number of RSUs) 25,000  
Fair Value of Time-Based Restricted Cash Units $ 21.20  
Restricted Cash Units (RCUs) [Member] | Market-based vesting schedule [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted at fair market value (in number of RSUs) 87,000  
Fair Value of Market-Vesting Restricted Cash Units $ 17.14  
Stock Appreciation Rights (SARs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding stock appreciation rights 500,000  
Weighted average exercise price $ 24.40  
Weighted average remaining contractual life (in years) 3 months 18 days  
Restricted Stock Units (RSUs) [Member] | Time-based vesting schedule [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted at fair market value (in number of RSUs) 585,000  
Restricted Stock Units (RSUs) [Member] | Market-based vesting schedule [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted at fair market value (in number of RSUs) 87,000  
Restricted Stock Units (RSUs) [Member] | Performance-Based Vesting Schedule [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted at fair market value (in number of RSUs) 374,000  
Zipcar [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill 112  
Business Acquisition, Purchase Price Allocation, Goodwill Amount 274  
Finite-Lived Intangible Asset, Useful Life 8 years  
Business Acquisition, Effective Date of Acquisition Mar. 14, 2013  
Apex [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill 21  
Business Acquisition, Purchase Price Allocation, Goodwill Amount 16  
Business Acquisition, Effective Date of Acquisition Oct. 01, 2012  
Number Of Vehicles 4,000  
Business Acquisition, Cost of Acquired Entity, Cash Paid 63  
Business Acquisition, Contingent Consideration, at Fair Value 9  
Business Acquisition, Contingent Consideration, Potential Cash Payment 26  
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment 33  
Business Acquisition, Contingent Consideration, Potential Cash Payment 26  
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment $ 33