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Asset Impairment Expense (Tables)
3 Months Ended
Mar. 31, 2014
Impairment or Disposal of Tangible Assets Disclosure [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset
 
 
Three Months Ended March 31,
 
 
2014
 
2013
 
 
(in millions)
Beaver Valley
 
$

 
$
46

DP&L (East Bend)
 
12

 

Other
 

 
2

Total asset impairment expense
 
$
12

 
$
48