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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2021
PPL Electric Utilities Corp [Member]  
Related Party Transactions [Line Items]  
Intercompany Support Cost Allocations PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended September 30, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable.
 Three MonthsNine Months
 2021202020212020
PPL Electric from PPL Services
$15 $11 $36 $37 
PPL Electric from PPL EU Services48 44 147 126 
LG&E from LKS40 43 126 125 
KU from LKS43 45 132 132 
Louisville Gas And Electric Co [Member]  
Related Party Transactions [Line Items]  
Intercompany Support Cost Allocations PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended September 30, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable.
 Three MonthsNine Months
 2021202020212020
PPL Electric from PPL Services
$15 $11 $36 $37 
PPL Electric from PPL EU Services48 44 147 126 
LG&E from LKS40 43 126 125 
KU from LKS43 45 132 132 
Kentucky Utilities Co [Member]  
Related Party Transactions [Line Items]  
Intercompany Support Cost Allocations PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended September 30, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable.
 Three MonthsNine Months
 2021202020212020
PPL Electric from PPL Services
$15 $11 $36 $37 
PPL Electric from PPL EU Services48 44 147 126 
LG&E from LKS40 43 126 125 
KU from LKS43 45 132 132