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Other Income and Expense (Nonoperating Income) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Other Income and Expenses [Abstract] |  |  |
Contract termination - Beaver Valley | $ 60 | $ 0 | $ 0
Gain on sale of assets | 12 | 21 | 46
Reversal of legal contingency | 10 | 0 | 0
Insurance proceeds | 0 | 38 | 11
Tax credit settlement | 0 | 0 | 31
Gain on extinguishment of tax and other liabilities | 9 | 0 | 14
Other | 34 | 39 | 40
Total other income | $ 125 | $ 98 | $ 142

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- Definition Gain (Loss) on Extinguishment of Tax and Other Liabilities + References No definition available. + Details
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