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Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]    
Sale of call options, tax $ (1)car_TaxEffectsOnCallOptions $ (1)car_TaxEffectsOnCallOptions