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Utility Rate Regulation (Regulatory Matters) (Details) - USD ($) $ in Millions |  |  |  |  | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 25, 2020 | Sep. 29, 2020 | May 21, 2020 | Mar. 31, 2020 | Jun. 30, 2022 | Dec. 31, 2020 | Dec. 31, 2019 | May 31, 2026 | Jun. 30, 2020
LKE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities Expected Capital Costs To Comply |  |  |  |  |  |  |  |  | $ 405
LKE [Member] | Kentucky Public Service Commission [Member] | Electric And Gas Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | $ 331 |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Bill Credit | 53 |  |  |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.00% |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Return on equity |  | 9.20% |  |  |  | 9.20% | 9.725% |  |
Requested return on equity |  |  |  | 9.725% |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  | 12 months |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | $ 30 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 8.30% |  |  |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Electric And Gas Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Bill Credit | $ 41 |  |  |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | $ 131 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 11.60% |  |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.00% |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Return on equity |  | 9.20% |  |  |  | 9.20% | 9.725% |  |
Requested return on equity |  |  |  | 9.725% |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  | 12 months |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | $ 170 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 10.40% |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Bill Credit | $ 12 |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | PPL Electric [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Return on equity |  |  | 11.18% |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Proposed Return Of Equity From Complaint |  |  | 8.00% |  |  |  |  |  |
Amended Proposed Return On Equity From Complaint |  |  | 8.50% |  |  |  |  |  |
Change in Net Income Due to ROE Adjustment |  |  |  |  |  | $ 12 |  |  |
Act 129 Recovery Period Under Phase IV Plan |  |  |  |  |  |  |  | 5 years |
LG And E And KU Energy LLC [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities Expected Capital Costs To Comply |  |  |  |  |  |  |  |  | 405
LG And E And KU Energy LLC [Member] | Kentucky Public Service Commission [Member] | Electric And Gas Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | 331 |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Bill Credit | 53 |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.00% |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Return on equity |  | 9.20% |  |  |  | 9.20% | 9.725% |  |
Requested return on equity |  |  |  | 9.725% |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  | 12 months |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities Expected Capital Costs To Comply |  |  |  |  |  |  |  |  | 153
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | $ 30 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 8.30% |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric And Gas Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Bill Credit | $ 41 |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | $ 131 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 11.60% |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.00% |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Return on equity |  | 9.20% |  |  |  | 9.20% | 9.725% |  |
Requested return on equity |  |  |  | 9.725% |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  | 12 months |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities Expected Capital Costs To Comply |  |  |  |  |  |  |  |  | 252
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | $ 170 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 10.40% |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Bill Credit | $ 12 |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.00% |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Return on equity |  | 9.20% |  |  |  | 9.20% | 9.725% |  |
Requested return on equity |  |  |  | 9.725% |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  | 12 months |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities Expected Capital Costs To Comply |  |  |  |  |  |  |  |  | 153
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | $ 30 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 8.30% |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric And Gas Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Bill Credit | $ 41 |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | $ 131 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 11.60% |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.00% |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Return on equity |  | 9.20% |  |  |  | 9.20% | 9.725% |  |
Requested return on equity |  |  |  | 9.725% |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  | 12 months |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities Expected Capital Costs To Comply |  |  |  |  |  |  |  |  | $ 252
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing | $ 170 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 10.40% |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Bill Credit | $ 12 |  |  |  |  |  |  |  |

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- Definition The period over which Act 129 Phase IV Plan costs will be recovered in "PnYnMnDTnHnMnS" format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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