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Consolidated Statements Of Stockholders' Equity (Parenthetical) $ in Millions | 12 Months Ended
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Dec. 31, 2013 USD ($)
Statement of Stockholders' Equity [Abstract] |
Sale of call options, tax | $ (1)

X
- Definition Tax Effects On Call Options + References No definition available. + Details
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Namespace Prefix: | car_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration