Derivative Instruments and Hedging Activities (Offsetting Derivative Instruments and Credit Risk-Related Features) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Credit Risk-Related Contingent Features [Abstract]
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade	$ 4
Derivative Net Liability Position Containing Credit Risk Related Contingency Features	3
Treasury Derivatives [Member]
Offsetting Assets And Liabilities [Line Items]
Gross assets	9	$ 1
Derivative instruments eligible for offset - assets	5	0
Cash collateral received eligible for offset - assets	0	0
Net assets	4	1
Gross liabilities	16	67
Derivative instruments eligible for offset - liabilities	5	0
Cash collateral pledged eligible for offset - liabilities	0	0
Net liabilities	11	67
Louisville Gas And Electric Co [Member]
Offsetting Assets And Liabilities [Line Items]
Cash collateral received eligible for offset - assets	0	0
Cash collateral pledged eligible for offset - liabilities	0	0
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member]
Offsetting Assets And Liabilities [Line Items]
Gross assets	0	0
Derivative instruments eligible for offset - assets	0	0
Cash collateral received eligible for offset - assets	0	0
Net assets	0	0
Gross liabilities	3	7
Derivative instruments eligible for offset - liabilities	0	0
Cash collateral pledged eligible for offset - liabilities	0	0
Net liabilities	3	7
Kentucky Utilities Co [Member]
Offsetting Assets And Liabilities [Line Items]
Cash collateral received eligible for offset - assets	0	0
Cash collateral pledged eligible for offset - liabilities	$ 0	$ 0