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Utility Rate Regulation - Regulatory Matters (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended | 60 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Apr. 19, 2021 | Nov. 25, 2020 | May 21, 2020 | Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2022 | May 31, 2026
Kentucky Public Service Commission [Member] | Electric and Gas Rates |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 331 |  |  |  |  |  |
Public Utilities, Requested Bill Credit |  |  | $ 53 |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 199 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ 217 |  |  |  |  |  |  |
PPL Electric [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  | 11.18% |  |  |  |  |
Proposed Return Of Equity From Complaint |  |  |  | 8.00% |  |  |  |  |
Amended Proposed Return On Equity From Complaint |  |  |  | 8.50% |  |  |  |  |
Regulatory Liability due to ROE Reserve, After Tax |  |  |  |  | $ 17 |  | $ 7 |  |
LGE [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
RAR Rider post-retirement recovery period |  | 10 years |  |  |  |  |  |  |
Stay Out Commitment Period | 4 years | 4 years |  |  |  |  |  |  |
Requested Billing Credit Period | 1 year | 1 year | 1 year |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.425% |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 9.55% |  |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  |  |  |  |  | 10.00% |
LGE [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Bill Credit |  |  | $ 41 |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 131 |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  | 11.60% |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 73 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ 77 |  |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 30 |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  | 8.30% |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 20 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ 24 |  |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery and Gas Line Tracker |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.35% |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 9.35% |  |  |  |  |  |  |
KU [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
RAR Rider post-retirement recovery period |  | 10 years |  |  |  |  |  |  |
Stay Out Commitment Period | 4 years | 4 years |  |  |  |  |  |  |
Requested Billing Credit Period | 1 year | 1 year | 1 year |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.425% |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 9.55% |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  |  |  |  |  | 10.00% |
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 170 |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  | 10.40% |  |  |  |  |  |
Public Utilities, Requested Bill Credit |  |  | $ 12 |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 106 | $ 116 |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.35% |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 9.35% |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  | 11.18% |  |  |  |  |
Proposed Return Of Equity From Complaint |  |  |  | 8.00% |  |  |  |  |
Amended Proposed Return On Equity From Complaint |  |  |  | 8.50% |  |  |  |  |
Regulatory Liability due to ROE Reserve, After Tax |  |  |  |  | $ 17 |  | 7 |  |
PPL Electric Utilities Corp [Member] | PPL Electric [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Act 129 Recovery Period Under Phase IV Plan |  |  |  |  |  |  |  |  | 5 years
Regulatory Liability due to ROE Reserve, After Tax |  |  |  |  |  | $ 36 | $ 20 |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
RAR Rider post-retirement recovery period |  | 10 years |  |  |  |  |  |  |
Stay Out Commitment Period | 4 years | 4 years |  |  |  |  |  |  |
Requested Billing Credit Period | 1 year | 1 year | 1 year |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.425% |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 9.55% |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  |  |  |  |  | 10.00% |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Bill Credit |  |  | $ 41 |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 131 |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  | 11.60% |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 73 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ 77 |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 30 |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  | 8.30% |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 20 |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ 24 |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery and Gas Line Tracker |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.35% |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 9.35% |  |  |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
RAR Rider post-retirement recovery period |  | 10 years |  |  |  |  |  |  |
Stay Out Commitment Period | 4 years | 4 years |  |  |  |  |  |  |
Requested Billing Credit Period | 1 year | 1 year | 1 year |  |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.425% |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 9.55% |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  |  |  |  |  | 10.00% |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 170 |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  | 10.40% |  |  |  |  |  |
Public Utilities, Requested Bill Credit |  |  | $ 12 |  |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.35% |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 9.35% |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 106 | $ 116 |  |  |  |  |  |  |

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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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