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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 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 Months
 20212020
PPL Electric from PPL Services
$10 $10 
LKE from PPL Services6 6 
PPL Electric from PPL EU Services50 41 
LG&E from LKS42 38 
KU from LKS44 41 
LG And E And KU Energy LLC [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 March 31, 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 Months
 20212020
PPL Electric from PPL Services
$10 $10 
LKE from PPL Services6 6 
PPL Electric from PPL EU Services50 41 
LG&E from LKS42 38 
KU from LKS44 41 
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 March 31, 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 Months
 20212020
PPL Electric from PPL Services
$10 $10 
LKE from PPL Services6 6 
PPL Electric from PPL EU Services50 41 
LG&E from LKS42 38 
KU from LKS44 41 
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 March 31, 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 Months
 20212020
PPL Electric from PPL Services
$10 $10 
LKE from PPL Services6 6 
PPL Electric from PPL EU Services50 41 
LG&E from LKS42 38 
KU from LKS44 41