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Asset Impairment Expense (Impairment of Long-Lived Assets Held and Used by Asset) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Beaver Valley | Dec. 31, 2012 Beaver Valley | Dec. 31, 2011 Beaver Valley | Dec. 31, 2013 DP&L (Conesville) | Dec. 31, 2012 DP&L (Conesville) | Dec. 31, 2011 DP&L (Conesville) | Dec. 31, 2013 Itabo (San Lorenzo) | Dec. 31, 2012 Itabo (San Lorenzo) | Dec. 31, 2011 Itabo (San Lorenzo) | Dec. 31, 2013 Wind Turbines And Projects | Dec. 31, 2012 Wind Turbines And Projects | Dec. 31, 2011 Wind Turbines And Projects | Dec. 31, 2013 Kelanitissa | Dec. 31, 2012 Kelanitissa | Dec. 31, 2011 Kelanitissa | Dec. 31, 2013 St. Patrick | Dec. 31, 2012 St. Patrick | Dec. 31, 2011 St. Patrick | Dec. 31, 2013 Other Impairment | Dec. 31, 2012 Other Impairment | Dec. 31, 2011 Other Impairment
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment expense | $ 95 | $ 73 | $ 173 | $ 46 | [1] | $ 0 | $ 0 | $ 26 | [1] | $ 0 | $ 0 | $ 16 | [1] | $ 0 | $ 0 | $ 0 | $ 41 | $ 116 | $ 0 | $ 19 | $ 42 | $ 0 | $ 11 | $ 0 | $ 7 | $ 2 | $ 15
[1] | See Note 21 — Asset Impairment Expense for further information.

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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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