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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2018
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
 
2018
 
2017
PPL Electric from PPL Services
$
16

 
$
51

LKE from PPL Services
7

 
6

PPL Electric from PPL EU Services
35

 
18

LG&E from LKS
38

 
44

KU from LKS
42

 
44
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
 
2018
 
2017
PPL Electric from PPL Services
$
16

 
$
51

LKE from PPL Services
7

 
6

PPL Electric from PPL EU Services
35

 
18

LG&E from LKS
38

 
44

KU from LKS
42

 
44
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
 
2018
 
2017
PPL Electric from PPL Services
$
16

 
$
51

LKE from PPL Services
7

 
6

PPL Electric from PPL EU Services
35

 
18

LG&E from LKS
38

 
44

KU from LKS
42

 
44
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
 
2018
 
2017
PPL Electric from PPL Services
$
16

 
$
51

LKE from PPL Services
7

 
6

PPL Electric from PPL EU Services
35

 
18

LG&E from LKS
38

 
44

KU from LKS
42

 
44