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Financing Activities - Distributions and Capital Contributions (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Distributions [Line Items] |  |  |  |
Current quarterly common stock dividend (in dollars per share) | $ 0.4150 | $ 1.66 | $ 1.65 | $ 1.64
Annualized current quarterly common stock dividend (in dollars per share) | $ 1.66 |  |  |
Deferred Interest Payment |  | $ 0 |  |
LKE [Member] |  |  |  |
Distributions [Line Items] |  |  |  |
Restricted net assets at end of period |  | 3,000 |  |
Unrestricted assets at the end of period |  | $ 3,700 |  |
Minimum adjusted equity to total capitalization in order to pay dividends |  | 30.00% |  |
LG And E And KU Energy LLC [Member] |  |  |  |
Distributions [Line Items] |  |  |  |
Restricted net assets at end of period |  | $ 3,000 |  |
Unrestricted assets at the end of period |  | $ 3,700 |  |
Minimum adjusted equity to total capitalization in order to pay dividends |  | 30.00% |  |
Louisville Gas And Electric Co [Member] |  |  |  |
Distributions [Line Items] |  |  |  |
Restricted net assets at end of period |  | $ 1,300 |  |
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 |  | $ 1,700 |  |
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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