XML 96 R57.htm IDEA: XBRL DOCUMENT v3.8.0.1
Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
PPL Electric Utilities Corp [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes receivable from affiliate $ 2   $ 2   $ 0
PPL Electric Utilities Corp [Member] | PPL Services [Member]          
Support Costs (Details) [Abstract]          
Support cost allocations from subsidiary of parent to registrant 43 $ 33 138 $ 98  
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]          
Support Costs (Details) [Abstract]          
Support cost allocations from subsidiary of parent to registrant 15 17 48 50  
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Intercompany note with affiliate maximum borrowing capacity 400   $ 400    
Intercompany borrowings demand note rate on outstanding borrowing     2.98%    
Notes receivable from affiliate 2   $ 2   0
LG And E And KU Energy LLC [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes payable to affiliates 159   159   163
Long-term debt to affiliate 400   400   400
Interest Expense with Affiliate 5 4 13 12  
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 15 13  
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    
Notes payable to affiliates 159   $ 159   $ 163
Intercompany borrowings demand note rate on outstanding borrowing     2.73%   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   $ 400    
Interest rate on ten-year note 3.50%   3.50%    
Louisville Gas And Electric Co [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes payable to affiliates $ 10   $ 10   $ 0
Louisville Gas And Electric Co [Member] | LKS [Member]          
Intercompany Billings by LKS (Details) [Abstract]          
Intercompany billings between affiliates 38 40 120 128  
Louisville Gas And Electric Co [Member] | Parent And Affiliate [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes payable to affiliates 10   $ 10   0
Intercompany borrowings demand note rate on outstanding borrowing     1.46%    
Intercompany Money Pool Agreement Maximum Borrowing Capacity 500   $ 500    
Kentucky Utilities Co [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes receivable from affiliate 10   10   0
Kentucky Utilities Co [Member] | LKS [Member]          
Intercompany Billings by LKS (Details) [Abstract]          
Intercompany billings between affiliates 43 $ 46 134 $ 151  
Kentucky Utilities Co [Member] | Parent And Affiliate [Member]          
Intercompany Borrowings (Numeric) [Abstract]          
Notes payable to affiliates 0   $ 0   0
Intercompany borrowings demand note rate on outstanding borrowing     1.46%    
Notes receivable from affiliate 10   $ 10   $ 0
Intercompany Money Pool Agreement Maximum Borrowing Capacity $ 500   $ 500