Asset Retirement Obligations (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	$ 177
Accretion	2
Changes in estimated timing or cost	(2)
Obligations settled	(7)
Asset Retirement Obligations, Period Change, Miscellaneous	(5)
Balance at End of Period	165
Louisville Gas And Electric Co [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	86
Accretion	1
Changes in estimated timing or cost	0
Obligations settled	(2)
Asset Retirement Obligations, Period Change, Miscellaneous	(6)
Balance at End of Period	79
Kentucky Utilities Co [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	82
Accretion	1
Changes in estimated timing or cost	0
Obligations settled	(5)
Asset Retirement Obligations, Period Change, Miscellaneous	0
Balance at End of Period	$ 78