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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Annual Depreciation Rates

The table below provides system-wide composite annual depreciation rates for the years ended December 31, 2015, 2014 and 2013.

 

     Transmission and
Distribution		    
Generation		  
     2015     2014     2013     2015     2014     2013  

Pepco

      2.3 %      2.3 %      2.2 %      —         —         —    

DPL

      2.6 %      2.6 %      2.6 %      —         —         —    

ACE

      2.6 %      2.6 %      2.8 %      —         —         —    

Pepco Energy Services

      —         —         —         0.6 %     1.2 %      0.4 %