Quarterly report pursuant to Section 13 or 15(d)

Investments In Available-For-Sale Securities And Other Cost Investments (Unrealized Holding Gains And Losses) (Details)

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Investments In Available-For-Sale Securities And Other Cost Investments (Unrealized Holding Gains And Losses) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Equity Securities [Member]
Dec. 31, 2012
Equity Securities [Member]
Mar. 31, 2013
Debt Securities [Member]
Dec. 31, 2012
Debt Securities [Member]
Mar. 31, 2013
SIRIUS XM [Member]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax         $ 40
Gross unrealized holding gains 6 2 1 37  
Gross unrealized holding losses $ 0 $ 0 $ 0 $ 0