Quarterly report pursuant to Section 13 or 15(d)

Investments In Available-For-Sale Securities And Other Cost Investments (Available-for-sale Securities, Including Fair Value Option Securities Separately Aggregated, and Other Cost Investments) (Details)

v2.4.0.8
Investments In Available-For-Sale Securities And Other Cost Investments (Available-for-sale Securities, Including Fair Value Option Securities Separately Aggregated, and Other Cost Investments) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments $ 1,099   $ 1,324
Proceeds from Sale of Available-for-sale Securities 247 12  
Other Investments [Member]
     
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 38   47
AFS and cost method investments
     
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 62   71
Barnes & Noble, Inc.
     
Schedule of Investments [Line Items]      
Sale of stock, ownership percentage of cost investment after transaction 2.00%    
Percentage of shares sold 90.00%    
Proceeds from Sale of Available-for-sale Securities 247    
Live Nation | Debt Securities
     
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 24   24
Fair Value Option Securities
     
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 1,037   1,253
Fair Value Option Securities | Time Warner Inc | Equity Securities
     
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 320   297
Fair Value Option Securities | Time Warner Cable Inc | Equity Securities
     
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 339   320
Fair Value Option Securities | Viacom, Inc. | Equity Securities
     
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 279   317
Fair Value Option Securities | Barnes & Noble, Inc. | Equity Securities
     
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 25   255
Fair Value Option Securities | Other AFS Equity Securities | Equity Securities
     
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 47   37
Fair Value Option Securities | Other AFS Debt Securities | Debt Securities
     
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments $ 27   $ 27