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Related Party Transactions (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
PPL Electric Utilities Corp [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes receivable from affiliate $ 270,000,000   $ 270,000,000   $ 0
PPL Electric Utilities Corp [Member] | PPL Services [Member]          
Support Costs (Details) [Abstract]          
Support cost allocations from subsidiary of parent to registrant 44,000,000 $ 28,000,000 95,000,000 $ 65,000,000  
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]          
Support Costs (Details) [Abstract]          
Support cost allocations from subsidiary of parent to registrant 15,000,000 16,000,000 $ 33,000,000 33,000,000  
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Intercompany borrowings demand note rate on outstanding borrowing     2.81%    
Notes receivable from affiliate 270,000,000   $ 270,000,000   0
LG And E And KU Energy LLC [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes payable to affiliates 159,000,000   159,000,000   163,000,000
Long-term debt to affiliate 400,000,000   400,000,000   400,000,000
Interest Expense with Affiliate 4,000,000 4,000,000 8,000,000 8,000,000  
LG And E And KU Energy LLC [Member] | PPL Services [Member]          
Support Costs (Details) [Abstract]          
Support cost allocations from subsidiary of parent to registrant 5,000,000 4,000,000 11,000,000 9,000,000  
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Intercompany note with affiliate maximum borrowing capacity 225,000,000   $ 225,000,000   $ 225,000,000
Intercompany borrowings demand note rate on outstanding borrowing     2.56%   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         $ 400,000,000
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 $ 400,000,000   $ 400,000,000    
Interest rate on ten-year note 3.50%   3.50%    
Louisville Gas And Electric Co [Member] | LKS [Member]          
Intercompany Billings by LKS (Details) [Abstract]          
Intercompany billings between affiliates $ 38,000,000 41,000,000 $ 82,000,000 88,000,000  
Kentucky Utilities Co [Member] | LKS [Member]          
Intercompany Billings by LKS (Details) [Abstract]          
Intercompany billings between affiliates $ 47,000,000 $ 49,000,000 $ 91,000,000 $ 105,000,000