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Utility Rate Regulation - Regulatory Matters (Details) - USD ($) $ in Millions |  |  | 6 Months Ended
--- | --- | --- | ---
May 21, 2020 | Mar. 31, 2020 | Jun. 30, 2020
PPL Electric [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Return on Equity, Percentage | 11.18% |  |
Change in Net Income due to ROE Adjustment |  |  | $ 12
Proposed Return Of Equity From Complaint | 8.00% |  |
Amended Proposed Return On Equity From Complaint | 8.50% |  |
LKE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |
Regulatory Matters [Line Items] |  |  |
Public Utilities Expected Capital Costs To Comply |  | $ 405 |
LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Return on Equity, Percentage |  | 972.50% |
KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Requested Return on Equity, Percentage |  | 972.50% |
PPL Electric Utilities Corp [Member] |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |
Public Utilities, Approved Return on Equity, Percentage | 11.18% |  |
Change in Net Income due to ROE Adjustment |  |  | $ 12
Proposed Return Of Equity From Complaint | 8.00% |  |
Amended Proposed Return On Equity From Complaint | 8.50% |  |
LG And E And KU Energy LLC [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |
Regulatory Matters [Line Items] |  |  |
Public Utilities Expected Capital Costs To Comply |  | $ 405 |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [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 |  | 972.50% |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [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 |  | 972.50% |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [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 |  | 972.50% |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [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 |  | 972.50% |

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