New Accounting Guidance Pending Adoption New Accounting Guidance Pending Adoption (Details) $ in Millions	Dec. 31, 2023 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of Use Asset	$ 74
Current lease liabilities	21
Non-current lease liabilities	63
Louisville Gas And Electric Co [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of Use Asset	13
Current lease liabilities	6
Non-current lease liabilities	9
Kentucky Utilities Co [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of Use Asset	19
Current lease liabilities	8
Non-current lease liabilities	$ 12