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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 18, 2015
Goodwill [Line Items] |  |  |  |  |  |
Goodwill impairment expense |  |  | $ 0 | $ 317 | $ 164 |
Goodwill | $ 1,157 | $ 1,157 | 1,157 | 1,157 | 1,458 |
Goodwill, Acquired During Period |  |  |  | 16 |  |
Goodwill | 3,912 | 3,912 | 3,912 | $ 3,912 | $ 3,896 |
Main street power [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 100.00%
Goodwill, Acquired During Period | $ 16 |  |  |  |  |
DPL Subsidiary [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill impairment expense |  | $ 317 |  |  |  |
Goodwill |  |  | $ 317 |  |  |

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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=65885119&loc=d3e1392-128463 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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