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
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2012
SIRIUS XM [Member]
Sep. 30, 2013
Charter Communications [Member]
May 01, 2013
Charter Communications [Member]
Mar. 31, 2013
Live Nation [Member]
Sep. 30, 2013
Live Nation [Member]
Dec. 31, 2012
Live Nation [Member]
Sep. 30, 2013
Sirius XM Canada [Member]
Sep. 30, 2013
Equity method investment, other [Member]
Dec. 31, 2012
Equity method investment, other [Member]
Payments to Acquire Equity Method Investments           $ 19          
Percentage ownership       26.00% [1] 27.00%   26.00% [2]   38.00% [3]    
Investments in affiliates, accounted for using the equity method 3,363 3,341 2,766 [3] 2,440 [3]     431 [2] 406 [2] 274 [3] 218 169
Equity Method Investment, Quoted Market Value       $ 3,619 [4]     $ 966 [4]   $ 385    
[1] (a)As discussed below, Liberty acquired its interest in Charter Communications, Inc. during the three months ended June 30, 2013 for approximately $2.6 billion.
[2] During the first quarter of 2013, Liberty acquired an additional 1.7 million shares of Live Nation for approximately $19 million.
[3] On January 18, 2013, as discussed in note 2, Liberty acquired an additional 50 million common shares and acquired a controlling interest in SIRIUS XM and as a result consolidates SIRIUS XM as of such date. SIRIUS XM has an investment in SIRIUS XM Canada that was recorded at fair value in purchase accounting. See discussion below of SIRIUS XM Canada.
[4] See note 10 for details regarding the number and fair value of shares pledged as collateral pursuant to certain margin loan agreements as of September 30, 2013.