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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
PPL Electric Utilities Corp [Member] | PPL Services [Member]      
Support Costs (Details) [Abstract]      
Support cost allocations from subsidiary of parent to registrant $ 182 $ 132 $ 125
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]      
Support Costs (Details) [Abstract]      
Support cost allocations from subsidiary of parent to registrant 64 69 60
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany note with affiliate maximum borrowing capacity 400    
Notes Receivable, Related Parties, Current 0 0  
LG And E And KU Energy LLC [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Notes payable to affiliates 225 163  
Long-term debt to affiliate 400 400  
Interest Expense, Related Party 18 17 3
LG And E And KU Energy LLC [Member] | PPL Services [Member]      
Support Costs (Details) [Abstract]      
Support cost allocations from subsidiary of parent to registrant $ 20 $ 18 16
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany borrowings demand note rate on outstanding borrowing 2.87% 2.12%  
Notes payable to affiliates $ 225 $ 163  
Intercompany note with affiliate maximum borrowing capacity 275    
Intercompany Note Affiliate Maximum Borrowing Capacity Increase $ 50    
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Debt Instrument, Term 10 years    
Intercompany borrowings demand note rate on outstanding borrowing 3.50%    
Long-term debt to affiliate $ 400    
Interest Expense, Related Party 14 14  
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany note with affiliate maximum borrowing capacity 300    
Long-term debt to affiliate 0 0  
Louisville Gas And Electric Co [Member]      
Intercompany Billings by LKS (Details) [Abstract]      
Intercompany billings between affiliates 169 178 155
Louisville Gas And Electric Co [Member] | Parent And Affiliate [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Notes payable to affiliates 0 0  
Intercompany Money Pool Agreement Maximum Borrowing Capacity 500    
Kentucky Utilities Co [Member]      
Intercompany Billings by LKS (Details) [Abstract]      
Intercompany billings between affiliates 190 194 $ 185
Kentucky Utilities Co [Member] | Parent And Affiliate [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Notes payable to affiliates 0 $ 0  
Intercompany Money Pool Agreement Maximum Borrowing Capacity $ 500