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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 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 $ 37 $ 30  
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]      
Support Costs (Details) [Abstract]      
Support cost allocations from subsidiary of parent to registrant 17 15  
LG And E And KU Energy LLC [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Notes payable to affiliates 147   $ 54
Long-term debt to affiliate 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 $ 5 4  
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany borrowings demand note rate on outstanding borrowing 1.94%   1.74%
Intercompany note with affiliate maximum borrowing capacity $ 225    
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany note with affiliate maximum borrowing capacity $ 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 $ 47 51  
Kentucky Utilities Co [Member] | LKS [Member]      
Intercompany Billings by LKS (Details) [Abstract]      
Intercompany billings between affiliates $ 56 $ 56