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Summary of Significant Accounting Policies (Narrative) (Details)
3 Months Ended
Mar. 31, 2014
sqmi
employee
Service Area Square Miles 6,000
Approximate number of retail customers 516,000
Electric generation through competitive bid 10.00%
Approximate number of DPLER customers 322,000
Entity number of employees 1,233
Number of coal fired power plants 7
Employees under a collective bargaining agreement which expires in October-2011 61.00%
DP&L [Member]
 
Service Area Square Miles 6,000
Approximate number of retail customers 516,000
Electric generation through competitive bid 10.00%
Entity number of employees 1,189
Number of coal fired power plants 7
Employees under a collective bargaining agreement which expires in October-2011 63.00%
Year 2014 [Member]
 
Public Utilities, Phase-in Plan Terms 10%
Year 2014 [Member] | DP&L [Member]
 
Public Utilities, Phase-in Plan Terms 10%
Year 2015 [Member]
 
Public Utilities, Phase-in Plan Terms 60%
Year 2015 [Member] | DP&L [Member]
 
Public Utilities, Phase-in Plan Terms 60%
Year 2016 [Member]
 
Public Utilities, Phase-in Plan Terms 100%
Year 2016 [Member] | DP&L [Member]
 
Public Utilities, Phase-in Plan Terms 100%