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Asset Impairment Expense (Tables)
3 Months Ended
Mar. 31, 2018
Impairment or Disposal of Tangible Assets Disclosure [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset
(in millions)
 
Three Months Ended March 31, 2017
Kazakhstan CHPs
 
$
94

DPL
 
66

Other
 
8

Total
 
$
168