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Asset Impairment Expense (Tables)
3 Months Ended
Mar. 31, 2015
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,
 
2015
 
2014
 
(in millions)
DP&L (East Bend)
$

 
$
12

Other
8

 

Total asset impairment expense
$
8

 
$
12