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Asset Impairment Expense (Tables) | 12 Months Ended
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Dec. 31, 2014
Impairment or Disposal of Tangible Assets Disclosure [Abstract] |
Details of Impairment of Long-Lived Assets Held and Used by Asset |
|  | Years Ended December 31,
|  | 2014 |  | 2013 |  | 2012
|  | (in millions)
Ebute |  | 67 |  |  | — |  |  | — |
UK Wind |  | 12 |  |  | — |  |  | — |
East Bend (DP&L) |  | 12 |  |  | — |  |  | — |
Beaver Valley |  | — |  |  | 46 |  |  | — |
Conesville (DP&L) |  | — |  |  | 26 |  |  | — |
Itabo (San Lorenzo) |  | — |  |  | 16 |  |  | — |
U.S. wind turbines and projects |  | — |  |  | — |  |  | 41 |
Kelanitissa |  | — |  |  | — |  |  | 19 |
St. Patrick |  | — |  |  | — |  |  | 11 |
Other |  | — |  |  | 7 |  |  | 2 |
Total asset impairment expense |  | $ | 91 |  |  | $ | 95 |  |  | $ | 73 |

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- Definition Tabular disclosure for impairment of long-lived assets held and used by an entity which includes a description of the impaired long-lived asset and facts and circumstances leading to the impairment, aggregate amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired long-lived asset is reported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section CC -Subsection 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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