Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	$ 177	$ 189
Asset Retirement Obligation acquired in an acquisition	0	10
Accretion	9	6
Obligations incurred	2	2
Changes in estimated cash flow or settlement date	15	15
Obligations settled	(39)	(45)
Other	(6)	0
Balance at End of Period	158	177
Louisville Gas And Electric Co [Member]
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	86	84
Asset Retirement Obligation acquired in an acquisition	0	0
Accretion	4	3
Obligations incurred	1	2
Changes in estimated cash flow or settlement date	11	12
Obligations settled	(11)	(15)
Other	(6)	0
Balance at End of Period	85	86
Kentucky Utilities Co [Member]
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	82	105
Asset Retirement Obligation acquired in an acquisition	0	0
Accretion	5	3
Obligations incurred	1	0
Changes in estimated cash flow or settlement date	6	4
Obligations settled	(28)	(30)
Other	0	0
Balance at End of Period	$ 66	$ 82