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Financing Activities (Distributions and Capital Contributions) (Details) - USD ($) $ / shares in Units, $ in Billions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | Nov. 30, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payable date of quarterly common stock dividend |  | Jan. 02, 2018 |  |  |  |  |  |  |  |  |  |  |
Current quarterly common stock dividend (in dollars per share) |  | $ 0.395 | $ 0.3950 | $ 0.3950 | $ 0.3950 | $ 0.3950 | $ 0.38 | $ 0.38 | $ 0.38 | $ 0.38 | $ 1.58 | $ 1.52 | $ 1.50
Annualized current quarterly common stock dividend (in dollars per share) |  | $ 1.58 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current quarterly common stock dividend (in dollars per share) | $ 0.410 |  |  |  |  |  |  |  |  |  |  |  |
Annualized current quarterly common stock dividend (in dollars per share) | $ 1.64 |  |  |  |  |  |  |  |  |  |  |  |
LKE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted net assets at end of period |  |  | $ 2.7 |  |  |  |  |  |  |  | $ 2.7 |  |
Unrestricted assets at the end of period |  |  | 3.1 |  |  |  |  |  |  |  | $ 3.1 |  |
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 |  |  | 2.7 |  |  |  |  |  |  |  | $ 2.7 |  |
Unrestricted assets at the end of period |  |  | 3.1 |  |  |  |  |  |  |  | $ 3.1 |  |
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 |  |  | 1.1 |  |  |  |  |  |  |  | $ 1.1 |  |
Unrestricted assets at the end of period |  |  | 1.4 |  |  |  |  |  |  |  | $ 1.4 |  |
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 |  |  | 1.6 |  |  |  |  |  |  |  | $ 1.6 |  |
Unrestricted assets at the end of period |  |  | $ 1.7 |  |  |  |  |  |  |  | $ 1.7 |  |
Minimum adjusted equity to total capitalization in order to pay dividends |  |  |  |  |  |  |  |  |  |  | 30.00% |  |

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