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Utility Rate Regulation - Regulatory Matters (Details) - Kentucky Public Service Commission [Member] - USD ($) $ in Millions | Apr. 30, 2019 | Mar. 01, 2019 | Sep. 28, 2018
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LKE [Member] | Electric And Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Estimated Total Revenue Increase | $ 187 |  |
LGE [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  | 10.42%
Public Utilities Proposed Return On Equity Percentage |  | 9.725% |
LGE [Member] | Electric Rates [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 35
Public Utilities Proposed Rate Increase Decrease Amount |  | $ 4 |
Public Utilities, Revenue Increase due to Elimination of TCJA Bill Credit |  | 40 |
LGE [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 2 |  |
LGE [Member] | Gas Rates [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 25
Public Utilities Proposed Rate Increase Decrease Amount |  | 20 |
Public Utilities, Revenue Increase due to Elimination of TCJA Bill Credit |  | $ 12 |
LGE [Member] | Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 19 |  |
LGE [Member] | Electric And Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Estimated Total Revenue Increase | 73 |  |
KU [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  | 10.42%
Public Utilities Proposed Return On Equity Percentage |  | 9.725% |
KU [Member] | Electric Rates [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 112
Public Utilities Proposed Rate Increase Decrease Amount |  | $ 58 |
Public Utilities, Revenue Increase due to Elimination of TCJA Bill Credit |  | $ 58 |
KU [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 56 |  |
KU [Member] | Electric And Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Estimated Total Revenue Increase | 114 |  |
LG And E And KU Energy LLC [Member] | Electric And Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Estimated Total Revenue Increase | 187 |  |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  | 10.42%
Public Utilities Proposed Return On Equity Percentage |  | 9.725% |
LG And E And KU Energy LLC [Member] | LGE [Member] | Electric Rates [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 35
Public Utilities Proposed Rate Increase Decrease Amount |  | $ 4 |
Public Utilities, Revenue Increase due to Elimination of TCJA Bill Credit |  | 40 |
LG And E And KU Energy LLC [Member] | LGE [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 2 |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Gas Rates [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 25
Public Utilities Proposed Rate Increase Decrease Amount |  | 20 |
Public Utilities, Revenue Increase due to Elimination of TCJA Bill Credit |  | $ 12 |
LG And E And KU Energy LLC [Member] | LGE [Member] | Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 19 |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Electric And Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Estimated Total Revenue Increase | 73 |  |
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  | 10.42%
Public Utilities Proposed Return On Equity Percentage |  | 9.725% |
LG And E And KU Energy LLC [Member] | KU [Member] | Electric Rates [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 112
Public Utilities Proposed Rate Increase Decrease Amount |  | $ 58 |
Public Utilities, Revenue Increase due to Elimination of TCJA Bill Credit |  | $ 58 |
LG And E And KU Energy LLC [Member] | KU [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 56 |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Electric And Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Estimated Total Revenue Increase | 114 |  |
Louisville Gas And Electric Co [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  | 10.42%
Public Utilities Proposed Return On Equity Percentage |  | 9.725% |
Louisville Gas And Electric Co [Member] | Electric Rates [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 35
Public Utilities Proposed Rate Increase Decrease Amount |  | $ 4 |
Public Utilities, Revenue Increase due to Elimination of TCJA Bill Credit |  | 40 |
Louisville Gas And Electric Co [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 2 |  |
Louisville Gas And Electric Co [Member] | Gas Rates [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 25
Public Utilities Proposed Rate Increase Decrease Amount |  | 20 |
Public Utilities, Revenue Increase due to Elimination of TCJA Bill Credit |  | $ 12 |
Louisville Gas And Electric Co [Member] | Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 19 |  |
Louisville Gas And Electric Co [Member] | Electric And Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Estimated Total Revenue Increase | 73 |  |
Kentucky Utilities Co [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  | 10.42%
Public Utilities Proposed Return On Equity Percentage |  | 9.725% |
Kentucky Utilities Co [Member] | Electric Rates [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 112
Public Utilities Proposed Rate Increase Decrease Amount |  | $ 58 |
Public Utilities, Revenue Increase due to Elimination of TCJA Bill Credit |  | $ 58 |
Kentucky Utilities Co [Member] | Electric Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 56 |  |
Kentucky Utilities Co [Member] | Electric And Gas Rates [Member] | Subsequent Event [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Estimated Total Revenue Increase | $ 114 |  |

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