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Related Party Transactions - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
TripAdvisor Inc.
         
Related Party Transaction [Line Items]          
Revenue recognized related to agreements with TripAdvisor $ 1 $ 2 $ 3 $ 3  
Expense recognized related to agreements with TripAdvisor 54 56 115 107  
Net amounts payable 35   35   24
Liberty
         
Related Party Transaction [Line Items]          
Common stock issued from treasury stock     467,672    
Price per share     $ 54.04    
stock issued, aggregate value     $ 25