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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% |  |

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