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Acquistions and Divestitures (Pro Forma Impact) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition, Pro Forma Information [Abstract]          
Pro forma revenue       $ 10,185  
Pro forma net income (loss)       382  
Amortization of other intangible assets   $ 159 $ 151 106  
Dollar Thrifty          
Business Acquisition, Pro Forma Information [Abstract]          
Revenue of acquiree since acquisition date, actual $ 171        
Earnings or loss of acquiree since acquisition date $ (26)        
Amortization of other intangible assets       39  
Interest expense, net       $ 73  
Pro Forma Adjustments, Assumed Tax Rate       39.00%  
Acquisition related costs and charges | Dollar Thrifty          
Business Acquisition, Pro Forma Information [Abstract]          
Labor and related expense         $ 47