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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 |  |

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