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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 |
6 Months Ended | ||||
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Jun. 30, 2013
Equity Securities [Member]
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Dec. 31, 2012
Equity Securities [Member]
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Jun. 30, 2013
Debt Securities [Member]
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Dec. 31, 2012
Debt Securities [Member]
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Jun. 30, 2013
SIRIUS XM [Member]
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| Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax | $ 40 | ||||
| Gross unrealized holding gains | 5 | 2 | 1 | 37 | |
| Gross unrealized holding losses | $ 0 | $ 0 | $ 0 | $ 0 |
| X | ||||||||||
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- Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. No definition available.
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