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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
PPL Electric Utilities Corp [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Notes receivable from affiliate $ 296   $ 499
PPL Electric Utilities Corp [Member] | PPL Services [Member]      
Support Costs (Details) [Abstract]      
Related Party Transaction, Amounts of Transaction 61 $ 10  
Intercompany Borrowings (Numeric) [Abstract]      
VEBA Funds Receivable     11
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]      
Support Costs (Details) [Abstract]      
Related Party Transaction, Amounts of Transaction 0 50  
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany note with affiliate maximum borrowing capacity 1,200    
Notes receivable from affiliate 296   499
PPL Electric Utilities Corp [Member] | Accounts receivable from affiliates [Member] | PPL Services [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
VEBA Funds Receivable 8    
Louisville Gas And Electric Co [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Notes receivable from affiliate 4   0
Notes Payable, Related Parties, Current 0   324
Louisville Gas And Electric Co [Member] | Parent And Affiliate [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany Money Pool Agreement Maximum Borrowing Capacity 325    
Notes Payable, Related Parties, Current 0    
Intercompany Borrowings Outstanding 324    
Louisville Gas And Electric Co [Member] | LKS [Member]      
Support Costs (Details) [Abstract]      
Related Party Transaction, Amounts of Transaction 39 42  
Kentucky Utilities Co [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Notes Payable, Related Parties, Current 4   $ 294
Intercompany Borrowings Outstanding 4    
Kentucky Utilities Co [Member] | Parent And Affiliate [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany Money Pool Agreement Maximum Borrowing Capacity 300    
Intercompany Borrowings Outstanding 294    
Kentucky Utilities Co [Member] | LKS [Member]      
Support Costs (Details) [Abstract]      
Related Party Transaction, Amounts of Transaction $ 44 $ 44