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Goodwill Impairment (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Goodwill [Line Items] |  |  |  |
Goodwill impairment | $ 1,850,000,000 | $ 17,000,000 | $ 1,850,000,000 | $ 17,000,000
Effective Income Tax Rate Continuing Operations | 14.00% |  | 187.00% |
DP&L [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross | 2,400,000,000 |  | 2,400,000,000 |
Goodwill impairment | 1,850,000,000 |  |  |
DP&L [Member] | Minimum |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill Impairment Loss Estimate | 1,700,000,000 |  |  |
DP&L [Member] | Maximum |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill Impairment Loss Estimate | 2,000,000,000 |  |  |
DPLER [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross | $ 128,000,000 |  | $ 128,000,000 |

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- Definition Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions. + 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 (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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