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Financing Activities - Distributions and Capital Contributions (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2025 | Nov. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Distributions [Line Items] |  |  |  |  |  |
Current quarterly common stock dividend (in dollars per share) |  |  | $ 0.2575 | $ 1.03 | $ 0.960 | $ 0.875
Annualized current quarterly common stock dividend (in dollars per share) |  | $ 1.03 |  |  |  |
Deferred Interest Payment |  |  |  | $ 0 |  |
Subsequent Event [Member] |  |  |  |  |  |
Distributions [Line Items] |  |  |  |  |  |
Current quarterly common stock dividend (in dollars per share) | $ 0.2725 |  |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |
Distributions [Line Items] |  |  |  |  |  |
Restricted net assets at end of period |  |  | $ 1,500 | 1,500 |  |
Unrestricted assets at the end of period |  |  | 1,800 | $ 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 |  |  | 2,000 | $ 2,000 |  |
Unrestricted assets at the end of period |  |  | $ 2,300 | $ 2,300 |  |
Minimum adjusted equity to total capitalization in order to pay dividends |  |  |  | 30.00% |  |

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