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Contractual Obligations, Commercial Commitments and Contingencies (Narative) (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
T
lb
Dec. 31, 2013
Mar. 31, 2015
Dec. 31, 2012
Mar. 01, 2011
Oct. 03, 2011
Public Utility, Property, Plant and Equipment [Line Items]            
Third party guarantees $ 20,500,000dpl_DisclosureOtherThirdPartyGuaranteesAmount   $ 20,500,000dpl_DisclosureOtherThirdPartyGuaranteesAmount      
Due to third parties, current 1,600,000dpl_DueToThirdPartiesCurrent 200,000dpl_DueToThirdPartiesCurrent 2,200,000dpl_DueToThirdPartiesCurrent      
Equity ownership interest 4.90%dpl_PublicUtilitiesEquityInterestCostMethodPercentage          
Environmental reserves 800,000us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet   800,000us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNet      
Percentage of energy generated by coal 99.00%dpl_PercentageOfEnergyGeneratedByCoal          
Emission Reductions 30.00%dpl_EmissionReductions          
Emission Reductions Ohio 28.00dpl_EmissionReductionsOhio          
Annual CO2 emissions generation at stations, in tons 14dpl_AnnualCo2EmissionsGenerationAtStations          
Relief and civil penalties, per day 27,500dpl_ReliefAndCivilPenalties          
Proceeds from Legal Settlements   14,600,000us-gaap_ProceedsFromLegalSettlements        
Interest and Other Income   1,800,000us-gaap_InterestAndOtherIncome        
Percentage Of Future Committed Coal 57.00%dpl_Percentageoffuturecommittedcoal          
Co2 Tons Per Megawatt Hour For Usepa on Natural Gas Fired Egus 1,000dpl_Co2tonspermegawatthourforusepaonnaturalgasfiredegus          
Electric Generation Company [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Debt obligation     1,519,300,000us-gaap_LongTermDebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= dpl_ElectricGenerationCompanyMember
     
DPLE and DPLER [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Third party guarantees 2,000,000dpl_DisclosureOtherThirdPartyGuaranteesAmount
/ us-gaap_PublicUtilityAxis
= dpl_DpleAndDplerMember
         
DPLER [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Third party guarantees     2,000,000dpl_DisclosureOtherThirdPartyGuaranteesAmount
/ us-gaap_PublicUtilityAxis
= dpl_DplerMember
     
DPLE [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Third party guarantees 18,300,000dpl_DisclosureOtherThirdPartyGuaranteesAmount
/ us-gaap_PublicUtilityAxis
= dpl_DpleMember
  18,300,000dpl_DisclosureOtherThirdPartyGuaranteesAmount
/ us-gaap_PublicUtilityAxis
= dpl_DpleMember
     
MC Squared [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Third party guarantees 200,000dpl_DisclosureOtherThirdPartyGuaranteesAmount
/ us-gaap_PublicUtilityAxis
= dpl_McSquaredMember
  200,000dpl_DisclosureOtherThirdPartyGuaranteesAmount
/ us-gaap_PublicUtilityAxis
= dpl_McSquaredMember
     
Coal Supply Agreements [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Coal supply failure by suppliers 1,500,000dpl_CoalSupplyFailureBySuppliers
/ us-gaap_PublicUtilityAxis
= us-gaap_CoalSupplyAgreementsMember
         
Coal supply agreement, in tons 570,000dpl_CoalSupplyAgreement
/ us-gaap_PublicUtilityAxis
= us-gaap_CoalSupplyAgreementsMember
         
Debt Obligation on 4.9% Equity Ownership [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Equity ownership interest 4.90%dpl_PublicUtilitiesEquityInterestCostMethodPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_DebtObligationOn49EquityOwnershipMember
  4.90%dpl_PublicUtilitiesEquityInterestCostMethodPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_DebtObligationOn49EquityOwnershipMember
4.90%dpl_PublicUtilitiesEquityInterestCostMethodPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_DebtObligationOn49EquityOwnershipMember
   
Equity ownership interest aggregate cost     74.4us-gaap_EquityMethodInvestmentAggregateCost
/ us-gaap_DebtInstrumentAxis
= dpl_DebtObligationOn49EquityOwnershipMember
     
Debt obligation 1,517,900,000us-gaap_LongTermDebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= dpl_DebtObligationOn49EquityOwnershipMember
         
Long Term Debt Date Range Equity Ownership, Start     2018      
Long Term Debt Date Range Equity Ownership, End     2040      
Debt Obligation on 4.9% Equity Ownership [Member] | DP&L [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Equity ownership interest aggregate cost $ 74,400,000us-gaap_EquityMethodInvestmentAggregateCost
/ us-gaap_DebtInstrumentAxis
= dpl_DebtObligationOn49EquityOwnershipMember
/ dei_LegalEntityAxis
= dpl_DpLMember
         
Long Term Debt Date Range Equity Ownership, Start 2015          
Long Term Debt Date Range Equity Ownership, End 2040          
Pollution Control Series Maturing in January 2028 - 4.70% [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Debt instrument interest percentage 4.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointSevenZeroPercentageOfPollutionControlSeriesMaturingInJanuaryTwoThousandTwentyEightMember
  4.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointSevenZeroPercentageOfPollutionControlSeriesMaturingInJanuaryTwoThousandTwentyEightMember
     
Pollution Control Series Maturing in January 2034 - 4.80% [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Debt instrument interest percentage 4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointEightZeroPercentageOfPollutionControlSeriesMaturingInJanuaryTwoThousandThirtyFourMember
  4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointEightZeroPercentageOfPollutionControlSeriesMaturingInJanuaryTwoThousandThirtyFourMember
     
Pollution Control Series Maturing in September 2036 - 4.80% [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Debt instrument interest percentage 4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointEightZeroPercentageOfPollutionControlSeriesMaturingInSeptemberTwoThousandThirtySixMember
  4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointEightZeroPercentageOfPollutionControlSeriesMaturingInSeptemberTwoThousandThirtySixMember
     
Pollution control series maturing in November 2040 - variable rates: 0.04% - 0.26% and 0.06% - 0.32% [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Debt instrument interest percentage     0.02%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_ZeroPointTwoThreeToZeroPointTwoNineAndZeroPointOneSixToZeroPointThreeSixPercentageOfPollutionControlSeriesMaturingInNovemberTwoThousandFortyMember
     
U.S. Government note maturing in February 2061 - 4.20% [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Debt instrument interest percentage 4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember
  4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember
  4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FourPointTwoZeroPercentageOfUSGovernmentNoteMaturingInFebruaryTwoThousandSixtyOneMember
 
Note to DPL Capital Trust II Maturing in September 2031 - 8.125% [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Debt instrument interest percentage 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_EightPointOneTwoFivePercentageOfNoteToCapitalTrustIiMaturingInSeptemberTwoThousandThirtyOneMember
  8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_EightPointOneTwoFivePercentageOfNoteToCapitalTrustIiMaturingInSeptemberTwoThousandThirtyOneMember
     
Senior Unsecured Notes at 6.50% maturing on October 15, 2016 [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Debt instrument interest percentage 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FiveYearSeniorUnsecuredNotesAt650MaturingOnOctober152016Member
6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FiveYearSeniorUnsecuredNotesAt650MaturingOnOctober152016Member
6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FiveYearSeniorUnsecuredNotesAt650MaturingOnOctober152016Member
    6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_FiveYearSeniorUnsecuredNotesAt650MaturingOnOctober152016Member
Ten Year Senior Unsecured Notes at 7.25% maturing at October 15, 2021 [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Debt instrument interest percentage 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_TenYearSeniorUnsecuredNotesAt725MaturingAtOctober152021Member
7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_TenYearSeniorUnsecuredNotesAt725MaturingAtOctober152021Member
7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_TenYearSeniorUnsecuredNotesAt725MaturingAtOctober152021Member
    7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= dpl_TenYearSeniorUnsecuredNotesAt725MaturingAtOctober152021Member
CO2 [Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
Emission Reductions     30.00%dpl_EmissionReductions
/ dpl_EnviromentalAxis
= dpl_Co2Member
     
Emission Reductions Ohio     28.0dpl_EmissionReductionsOhio
/ dpl_EnviromentalAxis
= dpl_Co2Member
     
Interim goals[Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
CO2 tons per megawatt-hour for USEPA standard on new EGUs 1,452dpl_Co2TonsPerMegawattHourForUsepaStandardOnNewEgus
/ dpl_EnviromentalAxis
= dpl_InterimGoalsMember
  1,452dpl_Co2TonsPerMegawattHourForUsepaStandardOnNewEgus
/ dpl_EnviromentalAxis
= dpl_InterimGoalsMember
     
Final goals[Member]            
Public Utility, Property, Plant and Equipment [Line Items]            
CO2 tons per megawatt-hour for USEPA standard on new EGUs 1,338dpl_Co2TonsPerMegawattHourForUsepaStandardOnNewEgus
/ dpl_EnviromentalAxis
= dpl_FinalGoalsMember
  1,338dpl_Co2TonsPerMegawattHourForUsepaStandardOnNewEgus
/ dpl_EnviromentalAxis
= dpl_FinalGoalsMember