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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
PPL Electric Utilities Corp [Member] | PPL Services [Member]      
Support Costs (Details) [Abstract]      
Support cost allocations from subsidiary of parent to registrant $ 125 $ 151 $ 146
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]      
Support Costs (Details) [Abstract]      
Support cost allocations from subsidiary of parent to registrant 60 0 0
LG And E And KU Energy LLC [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Notes payable to affiliates 54 41  
Long-term debt to affiliate 400 0  
LG And E And KU Energy LLC [Member] | PPL Services [Member]      
Support Costs (Details) [Abstract]      
Support cost allocations from subsidiary of parent to registrant $ 16 $ 15 15
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany borrowings demand note rate on outstanding borrowing 1.74% 1.65%  
Notes payable to affiliates $ 54 $ 41  
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 $ 300    
LG And E And KU Energy LLC [Member] | PPL Capital Funding [Member]      
Intercompany Borrowings (Numeric) [Abstract]      
Intercompany borrowings demand note rate on outstanding borrowing 3.50%    
Long-term debt to affiliate $ 400    
Louisville Gas And Electric Co [Member]      
Intercompany Billings by LKS (Details) [Abstract]      
Intercompany billings between affiliates 155 140 136
Kentucky Utilities Co [Member]      
Intercompany Billings by LKS (Details) [Abstract]      
Intercompany billings between affiliates $ 185 $ 165 $ 160