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Utility Rate Regulation - Regulatory Matters (Details) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 26, 2024 USD ($) | Nov. 06, 2023 MW | Sep. 27, 2023 USD ($) | Mar. 29, 2023 USD ($) | Oct. 16, 2018 | Aug. 24, 2018 | Dec. 31, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2016 | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Apr. 26, 2024 | Apr. 25, 2024 USD ($) | Nov. 21, 2023 USD ($)
Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  | $ 28 |  |  | $ 28 |  |  |  |
PPL Electric [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Billing Issues, Expenses Incurred |  |  |  |  |  |  |  | $ 2 | $ 6 |  | $ 17 | $ 9 |  |  |
Distribution System Improvement Charge Cap |  |  |  |  |  |  |  | 5.00% |  |  | 5.00% |  |  |  |
PPL Electric [Member] | Unaffiliated Third Party Entity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Purchase |  |  |  |  |  |  |  | $ 348 | 374 |  | $ 767 | 732 |  |  |
PPL Electric [Member] | Pennsylvania Public Utility Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Electric Billing Issue, Civil Penalty to be Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1
PPL Electric Billing Issue, Donation to be Paid |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |
Requested Distribution System Improvement Charge Cap |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |
LGE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities Power | MW |  | 640 |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  | 16 |  |  | 16 |  |  |  |
KU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities Power | MW |  | 640 |  |  |  |  |  |  |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  | 12 |  |  | $ 12 |  |  |  |
Rhode Island Energy | Federal Energy Regulatory Commsion [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New ROE prosed by NETO and approved by FERC |  |  |  |  | 10.41% |  |  |  |  |  |  |  |  |  |
Initial minimum base ROE to be reset by the FERC |  |  |  |  |  |  |  |  |  | 11.14% |  |  |  |  |
Maximum Base ROE reset by FERC |  |  |  |  |  |  |  |  |  | 11.74% |  |  |  |  |
Minimum base ROE reset by FERC |  |  |  |  |  |  |  |  |  | 10.57% |  |  |  |  |
Rhode Island Energy | Federal Energy Regulatory Commsion [Member] | Maximum ROE authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FERC Granted ROE |  |  |  |  |  |  |  |  |  |  | 11.74% |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  |  |  | 9.275% |  |  |  |  |  |  |  |  |
RIPUC Approved FY 2024 Gas ISR Plan for capital investment spend |  |  |  | $ 163 |  |  |  |  |  |  |  |  |  |  |
Recovery Cap on Capital Investment Related to AMF Program |  |  | $ 153 |  |  |  |  |  |  |  |  |  |  |  |
Capital Investment Spend on FY 2025 Gas ISR Plan |  |  |  |  |  |  | $ 185 |  |  |  |  |  |  |  |
Proposed Capital Investment Spend on FY 2025 Electric ISR Plan |  |  |  |  |  |  | 141 |  |  |  |  |  |  |  |
Proposed Contingency Plan Spend on FY 2025 Gas ISR Plan |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2025 Gas ISR Plan | $ 180 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Contingency Plan Spend on FY 2025 Gas ISR Plan | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2025 Gas ISR Plan | 168 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Paving Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2025 Gas ISR Plan | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Vegetation management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed Capital Investment Spend on FY 2025 Electric ISR Plan |  |  |  |  |  |  | 13 |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2025 Electric ISR Plan | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Other O&M |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed Capital Investment Spend on FY 2025 Electric ISR Plan |  |  |  |  |  |  | $ 1 |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2025 Electric ISR Plan | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2025 Electric ISR Plan | $ 132 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Vegetation management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RIPUC Approved FY 2024 Electric ISR Plan for capital investment spend |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Other O&M |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RIPUC Approved FY 2024 Electric ISR Plan for capital investment spend |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RIPUC Approved FY 2024 Electric ISR Plan for capital investment spend |  |  |  | $ 112 |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Common equity percentage related to approved rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common equity used on allowed ROE |  |  |  |  |  | 51.00% |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Billing Issues, Expenses Incurred |  |  |  |  |  |  |  | $ 2 | 6 |  | $ 17 | 9 |  |  |
Distribution System Improvement Charge Cap |  |  |  |  |  |  |  | 5.00% |  |  | 5.00% |  |  |  |
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Purchase |  |  |  |  |  |  |  | $ 348 | $ 374 |  | $ 767 | $ 732 |  |  |
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Electric Billing Issue, Civil Penalty to be Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1
PPL Electric Billing Issue, Donation to be Paid |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |
Requested Distribution System Improvement Charge Cap |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities Power | MW |  | 640 |  |  |  |  |  |  |  |  |  |  |  |  |
New NGCC LG&E Planned Ownership Percentage |  | 31.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  | 16 |  |  | 16 |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities Power | MW |  | 640 |  |  |  |  |  |  |  |  |  |  |  |  |
New NGCC KU Planned Ownership Percentage |  | 69.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | May 2024 Kentucky Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  | $ 12 |  |  | $ 12 |  |  |  |

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