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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, 2022 | Nov. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Distributions [Line Items] |  |  |  |  |
Current quarterly common stock dividend (in dollars per share) |  | $ 0.415 | $ 1.66 | $ 1.66 | $ 1.65
Annualized current quarterly common stock dividend (in dollars per share) |  | $ 1.66 |  |  |
Deferred Interest Payment |  |  | $ 0 |  |
Subsequent Event [Member] |  |  |  |  |
Distributions [Line Items] |  |  |  |  |
Current quarterly common stock dividend (in dollars per share) | $ 0.20 |  |  |  |
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 |  |  | $ 1,700 |  |
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 |  |  | $ 1,900 |  |
Unrestricted assets at the end of period |  |  | $ 2,000 |  |
Minimum adjusted equity to total capitalization in order to pay dividends |  |  | 30.00% |  |

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