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