Asset Retirement Obligations (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	$ 157
Accretion	6
Changes in estimated timing or cost	3
Obligations settled	(18)
Balance at End of Period	148
Louisville Gas And Electric Co [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	84
Accretion	3
Changes in estimated timing or cost	1
Obligations settled	(9)
Balance at End of Period	79
Kentucky Utilities Co [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	64
Accretion	3
Changes in estimated timing or cost	2
Obligations settled	(7)
Balance at End of Period	$ 62