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Derivative Instruments and Hedging Activities - Part 4 (Details) (DPL Subsidiary [Member], USD $)
Sep. 30, 2013
Dec. 31, 2012
DPL Subsidiary [Member]
   
Credit Risk-Related Contingent Features [Line Items]    
Net liability position, derivative transactions $ 10,000,000 $ 13,000,000
Collateral posted for derivative transactions 4,000,000 5,000,000
Cash Collateral Received From Counterparties 0  
Additional collateral that could have been required $ 1,000,000 $ 2,000,000