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Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
PPL Electric Utilities Corp [Member] | PPL Services [Member] |  |  |  |  |
Support Costs (Details) [Abstract] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 13 | $ 15 | $ 29 | $ 31 |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
VEBA Funds Receivable | 40 |  | 40 |  | $ 45
PPL Electric Utilities Corp [Member] | PPL EU Services [Member] |  |  |  |  |
Support Costs (Details) [Abstract] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | 37 | 41 | 74 | 76 |
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany note with affiliate maximum borrowing capacity | 650 |  | 650 |  |
Notes Receivable, Related Parties, Current | 0 |  | 0 |  | 0
PPL Electric Utilities Corp [Member] | Accounts receivable from affiliates [Member] | PPL Services [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
VEBA Funds Receivable | 10 |  | 10 |  | 10
PPL Electric Utilities Corp [Member] | Other Noncurrent Assets [Member] | PPL Services [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
VEBA Funds Receivable | 30 |  | 30 |  | 35
LG And E And KU Energy LLC [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Long-term debt to affiliate | 650 |  | 650 |  | 650
Interest Expense with Affiliate | 9 | 6 | 16 | 11 |
Notes payable with affiliates | 203 |  | 203 |  | 113
LG And E And KU Energy LLC [Member] | PPL Services [Member] |  |  |  |  |
Support Costs (Details) [Abstract] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | 5 | 7 | 14 | 14 |
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany note with affiliate maximum borrowing capacity | 375 |  | 375 |  |
Notes payable with affiliates | 203 |  | $ 203 |  | $ 113
Related Party Transaction, Rate |  |  | 3.93% |  | 3.85%
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany note with affiliate maximum borrowing capacity | 300 |  | $ 300 |  |
Notes Receivable, Related Parties, Current | 0 |  | $ 0 |  | $ 0
LG And E And KU Energy LLC [Member] | Note Payable [Member] | Affiliated Entity [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Debt instrument term (in years) |  |  | 10 years |  |
Long-term debt to affiliate | 400 |  | $ 400 |  |
Interest Expense with Affiliate | 4 | 3 | $ 7 | 7 |
Related Party Transaction, Rate |  |  | 3.50% |  |
LG And E And KU Energy LLC [Member] | Note Payable [Member] | Affiliated Entity [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Debt instrument term (in years) |  |  | 10 years |  |
Long-term debt to affiliate | 250 |  | $ 250 |  |
Interest Expense with Affiliate | 3 | 2 | $ 5 | 2 |
Related Party Transaction, Rate |  |  | 4.00% |  |
Louisville Gas And Electric Co [Member] | LKS [Member] |  |  |  |  |
Support Costs (Details) [Abstract] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | 37 | 39 | $ 75 | 77 |
Kentucky Utilities Co [Member] | LKS [Member] |  |  |  |  |
Support Costs (Details) [Abstract] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 41 | $ 43 | $ 84 | $ 85 |

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