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, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended
May 31, 2013
Sep. 30, 2014
Dec. 31, 2013
Equity Method Investments and Operating Activities Segment [Line Items]      
Investments in affiliates, accounted for using the equity method   $ 3,298 $ 3,299
Charter Communications
      
Equity Method Investments and Operating Activities Segment [Line Items]      
Purchase of shares in equity method investee 26,900,000 896,845  
Payments to Acquire Investments 2,600 124  
Percentage ownership 27.00% 25.00%  
Equity Method Investment, Quoted Market Value   4,201  
Investments in affiliates, accounted for using the equity method   2,376 2,395
Live Nation
      
Equity Method Investments and Operating Activities Segment [Line Items]      
Purchase of shares in equity method investee   1,700,000  
Payments to Acquire Investments   39  
Percentage ownership   27.00%  
Equity Method Investment, Quoted Market Value   1,291  
Investments in affiliates, accounted for using the equity method   452 409
Sirius XM Canada
      
Equity Method Investments and Operating Activities Segment [Line Items]      
Percentage ownership   37.00%  
Equity Method Investment, Quoted Market Value   304  
Investments in affiliates, accounted for using the equity method   239 273
Equity method investment, other
      
Equity Method Investments and Operating Activities Segment [Line Items]      
Investments in affiliates, accounted for using the equity method   $ 231 $ 222