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Asset Impairment Expense (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 MW | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 09, 2013 Beaver Valley MW | Dec. 31, 2013 Beaver Valley | Dec. 31, 2012 Beaver Valley | Dec. 31, 2011 Beaver Valley | Dec. 31, 2013 DP&L (Conesville) MW | 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) | Sep. 30, 2013 Itabo (San Lorenzo) MW | Jun. 30, 2013 Wind Turbines And Projects | 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
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Production Capacity (MW) | 2,465 |  |  | 125 |  |  |  |  | 129 |  |  |  |  |  |  |  | 35 |  |  |  |  |  |  |  |  |  |  |
Lump sum payment received for termination of PPA |  |  |  | $ 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | 95,000,000 | 73,000,000 | 173,000,000 |  | 46,000,000 | [1] | 0 | 0 | 26,000,000 | [1] | 0 | 0 | 16,000,000 | [1] | 0 | 0 |  |  | 0 |  | 41,000,000 | 116,000,000 | 0 | 19,000,000 | 42,000,000 | 0 | 11,000,000 | 0
Assets carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |  |  |  | 33,000,000 |
Assets, fair value |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  | 7,000,000 |  | 0 | [1] |  |  |  |  |  |  | 22,000,000 |
Gain (loss) on sale of assets | $ (14,000,000) | $ 174,000,000 | $ (20,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
[1] | See Note 21 — Asset Impairment Expense for further information.

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- Definition This element represents the aggregate carrying amount of the assets measured at fair value on a nonrecurring basis by the entity before the recognition of impairment charges. + 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 Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + 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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