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Business Combinations and Divestitures (Details) (USD $)
0 Months Ended 3 Months Ended 0 Months Ended 11 Months Ended 12 Months Ended 0 Months Ended
Nov. 19, 2012
Sep. 01, 2011
Jun. 30, 2011
Jun. 30, 2013
Dec. 31, 2012
Aug. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Nov. 19, 2012
Dollar Thrifty Automotive Group Inc.
Nov. 19, 2012
Dollar Thrifty Automotive Group Inc.
Sep. 01, 2011
Donlen Corporation
Dec. 31, 2012
Series of Individually Immaterial Business Acquisitions
location
Nov. 19, 2012
Trade name
Dollar Thrifty Automotive Group Inc.
Nov. 19, 2012
Concessions
Dollar Thrifty Automotive Group Inc.
Acquisition                            
Per share price                 $ 87.50 $ 87.50        
Recognized identifieable assets acquired, goodwill and liabiliteis assumed, net                 $ 2,592,000,000 $ 2,592,000,000 $ 250,000,000      
Payments to acquire business 2,551,000,000               2,551,000,000          
Cash and equivalents acquired in acquisition                 404,000,000 404,000,000        
Equity interest in acquiree, fair value                 41,000,000 41,000,000        
Remeasurement gain 8,400,000                          
Proceeds from issuance of debt                   1,950,000,000        
Aggregate maximum borrowings           1,950,000,000                
Other intangible assets                 1,546,000,000 1,546,000,000 75,000,000   1,140,000,000 406,000,000
Useful life (in years)                           9 years
Goodwill       1,366,300,000 1,341,872,000   392,094,000 328,600,000 885,000,000 885,000,000 51,100,000      
Percentage of voting interests acquired                     100.00%      
Consideration transferred                     250,000,000      
Provisional information, initial accounting incomplete, adjustment, consideration transferred   $ 2,400,000 $ (2,400,000)                      
Number of Businesses Acquired                       19