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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
PPL Electric Utilities Corp [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes receivable from affiliate $ 1,075   $ 1,075   $ 0
PPL Electric Utilities Corp [Member] | PPL Services [Member]          
Support Costs (Details) [Abstract]          
Related Party Transaction, Amounts of Transaction 11 $ 14 21 $ 26  
Intercompany Borrowings (Numeric) [Abstract]          
VEBA Funds Receivable 17   17   22
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]          
Support Costs (Details) [Abstract]          
Related Party Transaction, Amounts of Transaction 49 41 99 82  
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Intercompany note with affiliate maximum borrowing capacity 1,200   1,200    
Notes receivable from affiliate   1,075   1,075 0
PPL Electric Utilities Corp [Member] | Accounts receivable from affiliates [Member] | PPL Services [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
VEBA Funds Receivable 10   10   10
PPL Electric Utilities Corp [Member] | Other Noncurrent Assets [Member] | PPL Services [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
VEBA Funds Receivable 7   7   12
Louisville Gas And Electric Co [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes Payable, Related Parties, Current 282   282   0
Louisville Gas And Electric Co [Member] | Parent And Affiliate [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Intercompany Money Pool Agreement Maximum Borrowing Capacity 325   325    
Notes Payable, Related Parties, Current 0   0   0
Louisville Gas And Electric Co [Member] | LKS [Member]          
Support Costs (Details) [Abstract]          
Related Party Transaction, Amounts of Transaction 44 44 86 82  
Kentucky Utilities Co [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes Payable, Related Parties, Current 226   226   0
Kentucky Utilities Co [Member] | Parent And Affiliate [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Intercompany Money Pool Agreement Maximum Borrowing Capacity 300   300    
Notes Payable, Related Parties, Current 0   0   $ 0
Kentucky Utilities Co [Member] | LKS [Member]          
Support Costs (Details) [Abstract]          
Related Party Transaction, Amounts of Transaction 45 $ 46 89 $ 87  
LGE [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Intercompany Borrowings Outstanding 282   282    
KU [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Intercompany Borrowings Outstanding $ 226   $ 226