Quarterly report pursuant to Section 13 or 15(d)

Investments In Affiliates Accounted For Using The Equity Method (Schedule Of Equity Ownership And Carrying Amount) (Details)

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Investments In Affiliates Accounted For Using The Equity Method (Schedule Of Equity Ownership And Carrying Amount) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Interactive Group [Member]
Dec. 31, 2012
Interactive Group [Member]
Mar. 31, 2013
Interactive Group [Member]
HSN, Inc. [Member]
Dec. 31, 2012
Interactive Group [Member]
HSN, Inc. [Member]
Mar. 31, 2013
Interactive Group [Member]
Equity method investment, other [Member]
Dec. 31, 2012
Interactive Group [Member]
Equity method investment, other [Member]
Mar. 31, 2013
Ventures Group [Member]
Dec. 31, 2012
Ventures Group [Member]
Mar. 31, 2013
Ventures Group [Member]
Expedia [Member]
Dec. 31, 2012
Ventures Group [Member]
Expedia [Member]
Mar. 31, 2013
Ventures Group [Member]
Equity method investment, other [Member]
Dec. 31, 2012
Ventures Group [Member]
Equity method investment, other [Member]
Mar. 31, 2013
TripAdvisor, Inc. [Member]
Mar. 31, 2012
TripAdvisor, Inc. [Member]
Mar. 31, 2013
TripAdvisor, Inc. [Member]
Ventures Group [Member]
Ownership Interest In Investee                             22.00%    
Percentage ownership         37.00%           17.00%            
Investments in affiliates, accounted for using the equity method $ 870 $ 851 $ 319 $ 304 $ 261 $ 242 $ 58 $ 62 $ 551 $ 547 $ 430 [1] $ 431 [1] $ 121 $ 116     $ 0
Equity Method Investment, Quoted Market Value         1,098           1,385            
Revenue from Related Parties                             $ 60 $ 52  
[1] Liberty's 22% owned consolidated subsidiary TripAdvisor, Inc. earned revenue of approximately $60 million and $52 million for the three months ended March 31, 2013 and 2012, respectively, from Expedia, Inc. (TripAdvisor's former parent).