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Other Income and Expense (Nonoperating Income) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Contract termination - Beaver Valley | $ 20 | $ 0 | $ 60
Gain on sale of assets | 19 | 68 | 12
Other Nonoperating Income | 17 | 9 | 6
Contingency reversal | 0 | 18 | 10
Gain on extinguishment of tax and other liabilities | 0 | 0 | 9
Other | 27 | 29 | 28
Total other income | $ 83 | $ 124 | $ 125

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