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Related Party Transactions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Feb. 28, 2018
PPL Electric Utilities Corp [Member] | PPL Services [Member] |  |  |  |  |
Support Costs (Details) [Abstract] |  |  |  |  |
Support cost allocations from subsidiary of parent to registrant |  | $ 16 | $ 51 |  |
PPL Electric Utilities Corp [Member] | PPL EU Services [Member] |  |  |  |  |
Support Costs (Details) [Abstract] |  |  |  |  |
Support cost allocations from subsidiary of parent to registrant |  | 35 | 18 |  |
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany note with affiliate maximum borrowing capacity |  | 400 |  |  |
Notes receivable from affiliate |  | 0 |  | $ 0 |
LG And E And KU Energy LLC [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Notes payable to affiliates |  | 237 |  | 225 |
Long-term debt to affiliate |  | 400 |  | 400 |
Interest Expense with Affiliate |  | 5 | 4 |  |
LG And E And KU Energy LLC [Member] | PPL Services [Member] |  |  |  |  |
Support Costs (Details) [Abstract] |  |  |  |  |
Support cost allocations from subsidiary of parent to registrant |  | 7 | 6 |  |
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany note with affiliate maximum borrowing capacity |  | 300 |  |  |
Notes payable to affiliates |  | $ 237 |  | $ 225 |
Intercompany borrowings demand note rate on outstanding borrowing |  | 3.17% |  | 2.87% |
Intercompany Note Affiliate Maximum Borrowing Capacity Increase |  |  |  |  | $ 25
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 |  |  |
Interest rate on ten-year note |  | 3.50% |  |  |
Interest Expense with Affiliate |  | $ 4 | 4 |  |
LG And E And KU Energy LLC [Member] | Note Payable [Member] | Affiliated Entity [Member] | Subsequent Event [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Stated interest rate | 4.00% |  |  |  |
Maturity date | May 31, 2028 |  |  |  |
Notes Payable, Noncurrent | $ 250 |  |  |  |
Louisville Gas And Electric Co [Member] | LKS [Member] |  |  |  |  |
Intercompany Billings by LKS (Details) [Abstract] |  |  |  |  |
Intercompany billings between affiliates |  | 38 | 44 |  |
Kentucky Utilities Co [Member] | LKS [Member] |  |  |  |  |
Intercompany Billings by LKS (Details) [Abstract] |  |  |  |  |
Intercompany billings between affiliates |  | $ 42 | $ 44 |  |

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