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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
PPL Electric Utilities Corp [Member] | PPL Services [Member]          
Support Costs (Details) [Abstract]          
Support cost allocations from subsidiary of parent to registrant $ 33 $ 35 $ 98 $ 90  
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]          
Support Costs (Details) [Abstract]          
Support cost allocations from subsidiary of parent to registrant 17 12 50 44  
LG And E And KU Energy LLC [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes payable to affiliates 138   138   $ 54
Long-term debt to affiliate 400   400   $ 400
LG And E And KU Energy LLC [Member] | PPL Services [Member]          
Support Costs (Details) [Abstract]          
Support cost allocations from subsidiary of parent to registrant 4 4 13 12  
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Intercompany note with affiliate maximum borrowing capacity 225   $ 225    
Intercompany borrowings demand note rate on outstanding borrowing     2.02%   1.74%
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Debt instrument term (in years)     10 years   10 years
Long-term debt to affiliate $ 400   $ 400   $ 400
Interest rate on ten-year note 3.50%   3.50%   3.50%
Louisville Gas And Electric Co [Member] | LKS [Member]          
Intercompany Billings by LKS (Details) [Abstract]          
Intercompany billings between affiliates $ 40 36 $ 128 107  
Kentucky Utilities Co [Member] | LKS [Member]          
Intercompany Billings by LKS (Details) [Abstract]          
Intercompany billings between affiliates $ 46 $ 43 $ 151 $ 127