Quarterly report pursuant to Section 13 or 15(d)

Basis Of Presentation Basis of Presentation (Details)

v2.4.0.8
Basis Of Presentation Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
TripAdvisor, Inc. [Member]
Dec. 31, 2012
TripAdvisor, Inc. [Member]
Dec. 11, 2012
TripAdvisor, Inc. [Member]
Prior Period Reclassification Adjustment         $ 30    
Related Party Transaction, Amounts of Transaction 4 2 8 5      
Purchase of shares in equity method investee           4.8  
ownership percentage acquired             0.00%
Business Acquisition, Cost of Acquired Entity, Cash Paid             $ 300
Ownership Interest In Investee             0.00%
Business Acquisition, Percentage of Voting Interests Acquired             57.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners             78.00%