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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
|---|---|
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Dec. 31, 2013
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| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |
| Balance at January 1, 2013 | $ 95 |
| Decreases related to prior year tax positions | (11) |
| Increases related to current year tax positions | 12 |
| Settlements | (7) |
| Balance at December 31, 2013 | $ 89 |