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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 |
Mar. 31, 2012
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Dec. 31, 2011
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Equity Securities [Member]
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| Gross unrealized holding gains | $ 1 | $ 1 |
| Gross unrealized holding losses | 0 | 0 |
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Debt Securities [Member]
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| Gross unrealized holding gains | 62 | 57 |
| Gross unrealized holding losses | $ 0 | $ 0 |
| 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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