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Asset Impairment Expense (Tables)
3 Months Ended
Mar. 31, 2017
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,
(in millions)
 
2017
 
2016
Kazakhstan
 
$
94

 
$

DP&L
 
66

 

Tait Energy Storage
 
8

 

Buffalo Gap II
 

 
159

Total
 
$
168

 
$
159