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Other Income and Expense (Nonoperating Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
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