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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Annual Depreciation Rates

The table below provides system-wide composite annual depreciation rates for the years ended December 31, 2014, 2013 and 2012.

 

     Transmission and
Distribution		     Generation  
     2014     2013     2012     2014     2013     2012  

Pepco

      2.3 %      2.2 %      2.5 %      —         —         —    

DPL

      2.6 %      2.6 %      2.7 %      —         —         —    

ACE

      2.6 %      2.8 %      3.0 %      —         —         —    

Pepco Energy Services

      —         —         —         1.2 %     0.4 %      6.4 %(a)

 

(a) Percentage reflects accelerated depreciation of the Benning Road and Buzzard Point generating facilities retired during 2012.