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Goodwill Impairment (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Goodwill [Line Items] |  |
Goodwill impairment expense | $ 154,000,000 | $ 0
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 | 3 |
Generation capacity mega watts | 524 |

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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=25499696&loc=d3e19190-110258 + Details
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