Annual report pursuant to Section 13 and 15(d)

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

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Investments In Available-For-Sale Securities And Other Cost Investments (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
SIRIUS XM Debt Securities [Member]
May 01, 2013
Charter Communications [Member]
Dec. 31, 2013
Charter Communications [Member]
Jan. 18, 2013
SIRIUS XM [Member]
shares underlying borrowed share position, unwound           20,300,000  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net       $ 40      
Purchase of shares in equity method investee         26,900,000   50,000,000
Payments for (Proceeds from) Derivative Instrument, Financing Activities 299 54 (4)        
The total value of Non-strategic Securities 1,253 1,079          
Payments to Acquire Investments $ 2,585 $ 1,716 $ 350