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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
PPL Electric Utilities Corp [Member] | PPL Services [Member]      
Support Costs (Details) [Abstract]      
Support cost allocations from subsidiary of parent to registrant $ 51 $ 37  
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]      
Support Costs (Details) [Abstract]      
Support cost allocations from subsidiary of parent to registrant 18 17  
LG And E And KU Energy LLC [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Notes payable to affiliates 82   $ 163
Long-term debt to affiliate 400   $ 400
Interest Expense with Affiliate 4 4  
LG And E And KU Energy LLC [Member] | PPL Services [Member]      
Support Costs (Details) [Abstract]      
Support cost allocations from subsidiary of parent to registrant 6 5  
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany note with affiliate maximum borrowing capacity $ 225    
Intercompany borrowings demand note rate on outstanding borrowing 2.29%   2.12%
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Debt instrument term (in years)     10 years
Long-term debt to affiliate     $ 400
Interest rate on ten-year note     3.50%
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Debt instrument term (in years) 10 years    
Long-term debt to affiliate $ 400    
Interest rate on ten-year note 3.50%    
Louisville Gas And Electric Co [Member] | LKS [Member]      
Intercompany Billings by LKS (Details) [Abstract]      
Intercompany billings between affiliates $ 44 47  
Kentucky Utilities Co [Member] | LKS [Member]      
Intercompany Billings by LKS (Details) [Abstract]      
Intercompany billings between affiliates $ 44 $ 56