Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	$ 189	$ 182
Asset Retirement Obligation acquired in an acquisition	10	0
Accretion	6	16
Obligations incurred	2	0
Changes in estimated cash flow or settlement date	15	56
Obligations settled	(45)	(65)
Balance at End of Period	177	189
Louisville Gas And Electric Co [Member]
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	84	67
Asset Retirement Obligation acquired in an acquisition	0	0
Accretion	3	5
Obligations incurred	2	0
Changes in estimated cash flow or settlement date	12	40
Obligations settled	(15)	(28)
Balance at End of Period	86	84
Kentucky Utilities Co [Member]
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	105	115
Asset Retirement Obligation acquired in an acquisition	0	0
Accretion	3	11
Obligations incurred	0	0
Changes in estimated cash flow or settlement date	4	16
Obligations settled	(30)	(37)
Balance at End of Period	$ 82	$ 105