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Other Income and Expense (Nonoperating Income) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
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