Related Party Transactions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Dec. 31, 2011 TripAdvisor Inc. [Member]	Dec. 31, 2011 IAC [Member] years	Dec. 31, 2010 IAC [Member]
Amount paid to TripAdvisor	$ 4
Amounts payable	14
Airplane ownership interest		50.00%
Estimated useful life of airplane (in years)		10
Ownership interest in long-term investments and other assets		$ 16	$ 17