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Related Party Transactions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2018 | Jun. 30, 2018
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |  |  |
Interest Income from Affiliate |  |  | $ 8 | $ 5 | $ 0 |  |
PPL Electric Utilities Corp [Member] | PPL Services [Member] |  |  |  |  |  |  |
Related Party Transactions [Line Items] |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | 59 | 182 | 132 |  |
PPL Electric Utilities Corp [Member] | PPL EU Services [Member] |  |  |  |  |  |  |
Related Party Transactions [Line Items] |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | 148 | 64 | 69 |  |
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member] |  |  |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |  |  |
Intercompany note with affiliate maximum borrowing capacity |  |  | 650 |  |  |  |
Notes Receivable, Related Parties, Current |  |  |  | 0 | 0 |  |
Intercompany Note Affiliate Maximum Borrowing Capacity Increase |  |  |  |  |  |  | $ 250
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |  |  |
Notes payable to affiliates |  |  | 113 | 225 |  |  |
Interest Expense, Related Party |  |  | 25 | 18 | 17 |  |
Long-term debt to affiliate |  |  | 650 | 400 |  |  |
LG And E And KU Energy LLC [Member] | PPL Services [Member] |  |  |  |  |  |  |
Related Party Transactions [Line Items] |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | $ 26 | $ 20 | 18 |  |
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member] |  |  |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |  |  |
Intercompany borrowings demand note rate on outstanding borrowing |  |  | 3.85% | 2.87% |  |  |
Notes payable to affiliates |  |  | $ 113 | $ 225 |  |  |
Intercompany note with affiliate maximum borrowing capacity |  |  | $ 375 |  |  |  |
Intercompany Note Affiliate Maximum Borrowing Capacity Increase |  |  |  |  |  | $ 75 |
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% |  |  |  |
Interest Expense, Related Party |  |  | $ 14 | 14 |  |  |
Long-term debt to affiliate |  |  | 400 | 400 |  |  |
LG And E And KU Energy LLC [Member] | Affiliated Entity [Member] |  |  |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |  |  |
Interest Expense, Related Party |  | $ 7 |  |  |  |  |
LG And E And KU Energy LLC [Member] | Affiliated Entity [Member] | Note Payable [Member] |  |  |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |  |  |
Notes Payable, Noncurrent | $ 250 |  |  |  |  |  |
Stated interest rate | 4.00% |  |  |  |  |  |
Maturity date (in years) | May 31, 2028 |  |  |  |  |  |
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] | Parent And Affiliate [Member] |  |  |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |  |  |
Notes payable to affiliates |  |  | 0 | 0 |  |  |
Intercompany Money Pool Agreement Maximum Borrowing Capacity |  |  | 500 |  |  |  |
Louisville Gas And Electric Co [Member] | LKS [Member] |  |  |  |  |  |  |
Related Party Transactions [Line Items] |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | 151 | 169 | 178 |  |
Kentucky Utilities Co [Member] | Parent And Affiliate [Member] |  |  |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |  |  |
Notes payable to affiliates |  |  | 0 | 0 |  |  |
Intercompany Money Pool Agreement Maximum Borrowing Capacity |  |  | 500 |  |  |  |
Kentucky Utilities Co [Member] | LKS [Member] |  |  |  |  |  |  |
Related Party Transactions [Line Items] |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | $ 169 | $ 190 | $ 194 |  |

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