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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

X

- Definition

Estimated loss to be recognized from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill.

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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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.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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