Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
Investments In Available-For-Sale Securities And Other Cost Investments (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2011
Feb. 25, 2010
Jun. 30, 2011
Live Nation [Member]
Dec. 31, 2012
Time Warner Inc [Member]
Dec. 31, 2012
Sprint [Member]
Dec. 31, 2012
Viacom, Inc. [Member]
Dec. 31, 2012
SIRIUS XM [Member]
Sale of Available for Sale Securities, Shares             5,000,000 15,000,000 2,000,000  
Proceeds from Sale of Available-for-sale Securities             $ 225 $ 84 $ 105  
Payments for (Proceeds from) Derivative Instrument, Financing Activities 9 0 (751)       24 33 6  
Ownership Interest In Investee         14.60%          
The total value of Non-strategic Securities 1,079 1,435                
Payments to Acquire Investments 1,716 350 405     58        
Debt Instrument Principal amount tendered and retired                   $ 125
Subscription Agreement Shares       5,500,000