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Related Party Transactions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended		9 Months Ended
	Sep. 30, 2012 TripAdvisor Inc.	Sep. 30, 2012 TripAdvisor Inc. Year	Dec. 31, 2011 TripAdvisor Inc.	Sep. 30, 2012 Board of Directors Chairman	Oct. 09, 2012 Board of Directors Chairman Subsequent Event
Related Party Transaction [Line Items]
Combined voting power				62.00%	57.00%
Percentage of board members to be elected by separate class votes				25.00%
Various commercial agreement, maximum term in years		1
Revenue recognized related to agreements with TripAdvisor	$ 2	$ 5
Amount paid to TripAdvisor	57	164
Net amounts payable	$ 32	$ 32	$ 14

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Amount of transactions with related party during the financial reporting period.

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