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Utility Rate Regulation - Regulatory Matters (Details) - Kentucky Public Service Commission [Member] - Environmental Cost Recovery [Member] $ in Millions | 3 Months Ended
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Mar. 31, 2020 USD ($)
LKE [Member] |
Regulatory Matters [Line Items] |
Public Utilities Expected Capital Costs To Comply | $ 405
LGE [Member] |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |
Public Utilities, Requested Return on Equity, Percentage | 9.725%
KU [Member] |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |
Public Utilities, Requested Return on Equity, Percentage | 9.725%
LG And E And KU Energy LLC [Member] |
Regulatory Matters [Line Items] |
Public Utilities Expected Capital Costs To Comply | $ 405
LG And E And KU Energy LLC [Member] | LGE [Member] |
Regulatory Matters [Line Items] |
Public Utilities Expected Capital Costs To Comply | $ 153
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |
Public Utilities, Requested Return on Equity, Percentage | 9.725%
LG And E And KU Energy LLC [Member] | KU [Member] |
Regulatory Matters [Line Items] |
Public Utilities Expected Capital Costs To Comply | $ 252
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |
Public Utilities, Requested Return on Equity, Percentage | 9.725%
Louisville Gas And Electric Co [Member] |
Regulatory Matters [Line Items] |
Public Utilities Expected Capital Costs To Comply | $ 153
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |
Public Utilities, Requested Return on Equity, Percentage | 9.725%
Kentucky Utilities Co [Member] |
Regulatory Matters [Line Items] |
Public Utilities Expected Capital Costs To Comply | $ 252
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |
Public Utilities, Requested Return on Equity, Percentage | 9.725%

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