Financing Activities - Distributions and Capital Contributions (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		12 Months Ended
	Feb. 29, 2024	Nov. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Distributions [Line Items]
Current quarterly common stock dividend (in dollars per share)		$ 0.24	$ 0.960	$ 0.875	$ 1.660
Annualized current quarterly common stock dividend (in dollars per share)		$ 0.96
Deferred Interest Payment			$ 0
Subsequent Event [Member]
Distributions [Line Items]
Current quarterly common stock dividend (in dollars per share)	$ 0.2575
Louisville Gas And Electric Co [Member]
Distributions [Line Items]
Restricted net assets at end of period			1,500
Unrestricted assets at the end of period			$ 1,700
Minimum adjusted equity to total capitalization in order to pay dividends			30.00%
Kentucky Utilities Co [Member]
Distributions [Line Items]
Restricted net assets at end of period			$ 2,000
Unrestricted assets at the end of period			$ 2,200
Minimum adjusted equity to total capitalization in order to pay dividends			30.00%