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
Mar. 31, 2014
Dec. 31, 2013
May 01, 2013
Equity Method Investments and Operating Activities Segment [Line Items]      
Investments in affiliates, accounted for using the equity method $ 3,221 $ 3,299  
Charter Communications
      
Equity Method Investments and Operating Activities Segment [Line Items]      
Percentage ownership 25.00%   27.00%
Equity Method Investment, Quoted Market Value 3,309    
Investments in affiliates, accounted for using the equity method 2,323 2,395  
Live Nation
      
Equity Method Investments and Operating Activities Segment [Line Items]      
Percentage ownership 26.00% [1]    
Equity Method Investment, Quoted Market Value 1,132 [1]    
Investments in affiliates, accounted for using the equity method 396 [1] 409 [1]  
Sirius XM Canada
      
Equity Method Investments and Operating Activities Segment [Line Items]      
Percentage ownership 37.00%    
Equity Method Investment, Quoted Market Value 370    
Investments in affiliates, accounted for using the equity method 273 273  
Equity method investment, other
      
Equity Method Investments and Operating Activities Segment [Line Items]      
Investments in affiliates, accounted for using the equity method $ 229 $ 222  
[1] See note 8 for details regarding the number and fair value of shares pledged as collateral pursuant to certain margin loan agreements as of March 31, 2014.