Quarterly report pursuant to Section 13 or 15(d)

Basis Of Presentation Basis of Presentation (Details)

v2.4.0.6
Basis Of Presentation Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 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 3      
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%