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Derivative Instruments and Hedging Activities - Part 4 (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Credit Risk-Related Contingent Features [Line Items]
Gain on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring	$ 0	$ 6,000,000	$ 0	$ 6,000,000
DPL Subsidiary [Member]
Credit Risk-Related Contingent Features [Line Items]
Net liability position, derivative transactions	19,000,000		19,000,000		$ 12,000,000
Collateral posted for derivative transactions	7,000,000		7,000,000		5,000,000
Cash Collateral Received From Counterparties	$ 0		$ 0		$ 0

X

- Definition

The aggregated amount of cash collateral received from counterparties to our derivative positions, which is classified as restricted cash.

+ References

No definition available.

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4H



-Subparagraph (d)



-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4H



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

The amount of gain reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 30



-Section 50



-Paragraph 1



-Subparagraph (e)



-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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