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Asset Impairment Expense (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 09, 2013 MW | Mar. 31, 2014 | Mar. 31, 2013
Asset Impairment Expense [Line Items] |  |  |
Asset impairment expense |  | $ 12 | $ 48
Beaver Valley [Member] |  |  |
Asset Impairment Expense [Line Items] |  |  |
Asset impairment expense |  | 0 | 46
Generation capacity mega watts | 125 |  |
Lump sum payment received for termination of PPA | 60 |  |
East Bend DPL [Member] |  |  |
Asset Impairment Expense [Line Items] |  |  |
Asset impairment expense |  | 12 | 0
Generation capacity mega watts |  | 186 |
Assets, fair value |  | 2 |
Other Impairment [Member] |  |  |
Asset Impairment Expense [Line Items] |  |  |
Asset impairment expense |  | $ 0 | $ 2

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- Definition Generation Capacity Mega Watts + References No definition available. + Details
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- Definition Lump Sum Payment Received For Termination Of PPA + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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