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Utility Rate Regulation - Regulatory Matters (Details) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2025 USD ($) MW | Oct. 16, 2018 | Oct. 16, 2014 | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Mar. 13, 2025 | Oct. 04, 2024 USD ($) | Apr. 26, 2024
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | $ 2,049 | $ 2,060 | $ 2,049 |  |  |  |
aggregate projected capital expenditures | $ 3,700 |  |  |  |  |  |  |  |  |
Storm Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 116 | 113 | 116 |  |  |  |
PPL Electric [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Distribution System Improvement Charge Cap | 5.00% |  |  |  |  |  |  | 7.50% |  | 5.00%
PPL Electric [Member] | Unaffiliated Third Party Entity [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Purchase |  |  |  |  |  | 466 | $ 419 |  |  |
PPL Electric [Member] | Pennsylvania Public Utility Commission |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Requested Distribution System Improvement Charge Cap |  |  |  |  |  |  |  |  |  | 9.00%
LGE [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
CPCN NGCC Generation Unit | MW | 645 |  |  |  |  |  |  |  |  |
CPCN Battery Storage Facility | MW | 1,600 |  |  |  |  |  |  |  |  |
LGE [Member] | Mill Creek Unit 2 |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation or Processing |  |  |  | 215 |  | 215 |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation, Expected Remaining Book Value at Retirement |  |  |  | 161 |  | 161 |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Mill Creek Unit 1 retirement |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  |  | $ 125 |
LGE [Member] | Kentucky Public Service Commission [Member] | January 2025 KY Storm | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 2 |  | 2 |  |  |  |
KU [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
CPCN NGCC Generation Unit | MW | 645 |  |  |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | January 2025 KY Storm | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 7 |  | 7 |  |  |  |
Rhode Island Energy | Unaffiliated Third Party Entity [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Purchase |  |  |  |  |  | $ 87 | 51 |  |  |
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% |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  | 11.74% |  |  | 11.74% |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Contingency Plan Spend on FY 2026 Gas ISR Plan |  |  |  |  | 15 |  |  |  |  |
Capital Investment Spend on FY 2026 Gas ISR Plan |  |  |  |  | 187 |  |  |  |  |
Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  |  | 248 |  |  |  |  |
Total Approved Spend on FY 2026 Gas ISR Plan |  |  |  | 165 |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Other O&M |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  |  | 1 |  |  |  |  |
Approved Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  | 1 |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Vegetation management |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  |  | 14 |  |  |  |  |
Approved Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  | 14 |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | AMF Capital Investment |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2025 Electric ISR Plan |  |  |  |  | 88 |  |  |  |  |
Approved Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  | 88 |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  | 219 |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Paving Costs |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Capital Investment Spend on FY 2026 Gas ISR Plan |  |  |  |  | 22 |  |  |  |  |
Total Approved Spend on FY 2026 Gas ISR Plan |  |  |  | 18 |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Total Approved Spend on FY 2026 Gas ISR Plan |  |  |  | 147 |  |  |  |  |  |
Approved Contingency Plan Spend on FY 2026 Gas ISR Plan |  |  |  | 15 |  |  |  |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Distribution System Improvement Charge Cap | 5.00% |  |  |  |  |  |  | 7.50% |  | 5.00%
Regulatory assets |  |  |  | 685 | 673 | $ 685 |  |  |  |
PPL Electric Utilities Corp [Member] | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 41 | 22 | 41 |  |  |  |
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Purchase |  |  |  |  |  | 466 | $ 419 |  |  |
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Requested Distribution System Improvement Charge Cap |  |  |  |  |  |  |  |  |  | 9.00%
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 491 | 491 | 491 |  |  |  |
CPCN NGCC Generation Unit | MW | 645 |  |  |  |  |  |  |  |  |
BESS LG&E Planned Ownership Percentage | 0.32 |  |  |  |  |  |  |  |  |
CPCN Battery Storage Facility | MW | 1,600 |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Mill Creek Unit 2 |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation or Processing |  |  |  | 215 |  | 215 |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation, Expected Remaining Book Value at Retirement |  |  |  | 161 |  | 161 |  |  |  |
Louisville Gas And Electric Co [Member] | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 22 | 20 | 22 |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Mill Creek Unit 1 retirement |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  |  | $ 125 |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | January 2025 KY Storm | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 2 |  | 2 |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 460 | 458 | 460 |  |  |  |
CPCN NGCC Generation Unit | MW | 645 |  |  |  |  |  |  |  |  |
BESS KU Planned Ownership Percentage | 0.68 |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | 36 | $ 29 | 36 |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | January 2025 KY Storm | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  | $ 7 |  | $ 7 |  |  |  |

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