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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2015
Related Party Transactions [Abstract]  
Intercompany Support Cost Allocations
Talen Energy Supply was charged, primarily by PPL Services, the following amounts for the periods ended September 30, and believes these amounts were reasonable at the time, including amounts applied to accounts that are further distributed between capital and expense.           
 
Three Months
 
Nine Months
 
2015
 
2014
 
2015
 
2014
 
$
—

 
$
49

 
$
67

 
$
161