Quarterly report pursuant to Section 13 or 15(d)

Investments In Affiliates Accounted For Using The Equity Method (Schedule Of Liberty's Share Of Earnings (Losses) Of Affiliates) (Details)

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Investments In Affiliates Accounted For Using The Equity Method (Schedule Of Liberty's Share Of Earnings (Losses) Of Affiliates) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Interactive Group [Member]
Mar. 31, 2012
Interactive Group [Member]
Mar. 31, 2013
Interactive Group [Member]
HSN, Inc. [Member]
Mar. 31, 2012
Interactive Group [Member]
HSN, Inc. [Member]
Mar. 31, 2013
Interactive Group [Member]
Equity method investment, other [Member]
Mar. 31, 2012
Interactive Group [Member]
Equity method investment, other [Member]
Mar. 31, 2013
Ventures Group [Member]
Mar. 31, 2012
Ventures Group [Member]
Mar. 31, 2013
Ventures Group [Member]
Expedia [Member]
Mar. 31, 2012
Ventures Group [Member]
Expedia [Member]
Mar. 31, 2012
Ventures Group [Member]
TripAdvisor, Inc. [Member]
Mar. 31, 2013
Ventures Group [Member]
Equity method investment, other [Member]
Mar. 31, 2012
Ventures Group [Member]
Equity method investment, other [Member]
Dec. 31, 2012
TripAdvisor, Inc. [Member]
Dec. 11, 2012
TripAdvisor, Inc. [Member]
Purchase of shares in equity method investee                               4.8  
Share of earnings of affiliates, net (note 8) $ (11) $ 11 $ 16 $ 13 $ 20 $ 15 $ (4) $ (2) $ (27) $ (2) $ (20) $ (2) $ 11 [1] $ (7) $ (11)    
ownership percentage acquired                                 0.00%
Business Acquisition, Cost of Acquired Entity, Cash Paid                                 $ 300
[1] On December 11, 2012, we acquired approximately 4.8 million additional shares of common stock of TripAdvisor (an additional 4% equity ownership interest), for $300 million, and obtained voting control of TripAdvisor. Following the date of this transaction, TripAdvisor is accounted for as a consolidated subsidiary. See note 1 for additional details of this transaction.