Quarterly report pursuant to Section 13 or 15(d)

Investments In Available-For-Sale Securities And Other Cost Investments (Details)

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Investments In Available-For-Sale Securities And Other Cost Investments (Details) - USD ($)
shares in Millions, $ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments $ 654   $ 816
Proceeds from Sale of Available-for-sale Securities 149 $ 247  
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 0   0
Other Investments [Member]      
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 50   47
AFS and cost method investments      
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments $ 74   71
Viacom, Inc.      
Schedule of Investments [Line Items]      
Available for sale securities number of shares sold 1.8    
Proceeds from Sale of Available-for-sale Securities $ 122    
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 580   745
Fair Value Option Securities | Time Warner Inc | Equity Securities      
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 372   363
Fair Value Option Securities | Viacom, Inc. | Equity Securities      
Schedule of Investments [Line Items]      
Investments in available-for-sale securities and other cost investments 120   273
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 63   55
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 $ 25   $ 54