|
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% | ||||||