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Related Party Transactions (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
PPL Electric Utilities Corp [Member] | PPL Services [Member]        
Support Costs (Details) [Abstract]        
Support cost allocations from subsidiary of parent to registrant   $ 132 $ 125 $ 151
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]        
Support Costs (Details) [Abstract]        
Support cost allocations from subsidiary of parent to registrant   69 60 0
LG And E And KU Energy LLC [Member]        
Intercompany Borrowings (Numeric) [Abstract]        
Notes payable to affiliates   163 54  
Long-term debt to affiliate   400 400  
Interest Expense, Related Party   17 3 0
LG And E And KU Energy LLC [Member] | Senior Unsecured Notes [Member]        
Intercompany Borrowings (Numeric) [Abstract]        
Repayment of Debt $ 400      
Stated interest rate 2.125%      
Maturity date (in years) Nov. 15, 2015      
LG And E And KU Energy LLC [Member] | PPL Services [Member]        
Support Costs (Details) [Abstract]        
Support cost allocations from subsidiary of parent to registrant   $ 18 $ 16 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   2.12% 1.74%  
Notes payable to affiliates   $ 163 $ 54  
Intercompany note with affiliate maximum borrowing capacity   $ 225    
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    
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   178 155 140
Kentucky Utilities Co [Member]        
Intercompany Billings by LKS (Details) [Abstract]        
Intercompany billings between affiliates   $ 194 $ 185 $ 165