Financing Activities - Distributions and Capital Contributions (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		12 Months Ended
	Feb. 28, 2023	Nov. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Distributions [Line Items]
Current quarterly common stock dividend (in dollars per share)		$ 0.225	$ 0.875	$ 1.660	$ 1.660
Annualized current quarterly common stock dividend (in dollars per share)		$ 0.90
Deferred Interest Payment			$ 0
Preferred Stock, Value, Outstanding			$ 3
Preferred Stock, Dividend Preference or Restrictions			Pursuant to the preferred stock arrangement, as long as any preferred stock is outstanding, certain restrictions on payment of common stock dividends would come into effect if the common stock equity of RIE was, or by reason of payment of such dividends became, less than 25% of total capitalization of RIE.
Subsequent Event [Member]
Distributions [Line Items]
Current quarterly common stock dividend (in dollars per share)	$ 0.24
Louisville Gas And Electric Co [Member]
Distributions [Line Items]
Restricted net assets at end of period			$ 1,400
Unrestricted assets at the end of period			$ 1,800
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			$ 1,900
Unrestricted assets at the end of period			$ 2,100
Minimum adjusted equity to total capitalization in order to pay dividends			30.00%