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Goodwill Impairment (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) project MW | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment expense | $ 0 | $ 0 |  | $ 0 | $ 154,000,000
DPLER [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | $ 136,000,000 |  |
Goodwill implied fair value |  |  | 0 |  |
Goodwill impairment expense |  |  | 136,000,000 |  |
Buffalo Gap [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment expense |  |  | $ 18,000,000 |  |
Number of wind projects | project |  |  | 3 |  |
Generation Capacity Mega Watts | MW |  |  | 522 |  |

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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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