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Goodwill and Other Intangible Assets (Narrative) (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2014 USD ($) project | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Feb. 18, 2015
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment expense |  |  |  |  | $ 317,000,000 | $ 164,000,000 | $ 372,000,000 |
Goodwill | $ 1,157,000,000 | $ 1,157,000,000 | $ 1,458,000,000 |  | 1,157,000,000 | 1,458,000,000 | 1,622,000,000 |
Goodwill, Acquired During Period |  |  |  |  | 16,000,000 |  |  |
Goodwill | 3,912,000,000 | 3,912,000,000 | 3,896,000,000 |  | 3,912,000,000 | 3,896,000,000 | $ 3,954,000,000 |
Buffalo Gap |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment expense |  |  | $ 10,000,000 | $ 18,000,000 |  |  |  |
Number of wind projects | project |  |  |  | 3 |  |  |  |
DPLER |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment expense |  |  |  | $ 136,000,000 |  |  |  |
Goodwill |  |  |  | 136,000,000 |  |  |  |
Goodwill, fair value |  |  |  | $ 0 |  |  |  |
Main street power [Member] |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  | 100.00%
Goodwill, Acquired During Period | 16,000,000 |  |  |  |  |  |  |
Ebute [Member] |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  |  |  |  | $ 58,000,000 |  |
DPL Subsidiary [Member] |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment expense |  | 317,000,000 |  |  |  |  |  |
Goodwill | $ 317,000,000 | $ 317,000,000 |  |  | $ 317,000,000 |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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