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Utility Rate Regulation (Regulatory Matters) (Details) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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Feb. 16, 2026 USD ($) | Nov. 26, 2025 USD ($) | Oct. 20, 2025 USD ($) | Sep. 30, 2025 USD ($) | May 30, 2025 USD ($) | Feb. 28, 2025 USD ($) MW | Nov. 06, 2023 | Oct. 16, 2018 | Oct. 16, 2014 | Dec. 31, 2025 USD ($) | Mar. 31, 2025 USD ($) | Dec. 31, 2022 MW | Dec. 31, 2025 USD ($) | Nov. 24, 2025 USD ($) | Jun. 13, 2025 USD ($) | Mar. 13, 2025 | Feb. 24, 2025 USD ($) | Dec. 31, 2024 USD ($) | Apr. 26, 2024
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | $ 2,092,000,000 |  |  | $ 2,092,000,000 |  |  |  |  | $ 2,060,000,000 |
2025 CPCN Aggregate Projected Capital Expenditures |  |  |  |  |  | $ 3,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cane Run BESS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN Aggregate Projected Capital Expenditures 2026-2031 |  |  |  |  |  | 775,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Mill Creek NGCC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN Aggregate Projected Capital Expenditures 2026-2031 |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Storm Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 113,000,000 |  |  | 113,000,000 |  |  |  |  | 113,000,000 |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | $ 32,000,000 |  |  | $ 32,000,000 |  |  |  |  | 46,000,000 |
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 |  |  |  |  | $ 391,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 235,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Kentucky Public Service Commission [Member] | Electric And Gas Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 233,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Electric [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution System Improvement Charge Cap |  |  |  |  |  | 5.00% |  |  |  | 5.00% |  |  | 5.00% |  |  | 7.50% |  |  |
PPL Electric [Member] | Pennsylvania Public Utility Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested Distribution System Improvement Charge Cap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00%
PPL Electric [Member] | Pennsylvania Public Utility 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 |  |  |  | $ 356,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  |  | 8.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  | 11.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount Already Included In Customer Bills |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities, Power | MW |  |  |  |  |  |  |  |  |  |  |  | 645 |  |  |  |  |  |  |
CPCN NGCC Generation Unit | MW |  |  |  |  |  | 645 |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN Battery Storage Facility | MW |  |  |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Mill Creek Unit 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation or Processing |  |  |  |  |  |  |  |  |  | $ 199,000,000 |  |  | $ 199,000,000 |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity |  |  |  |  |  |  |  |  |  |  |  |  | 9.35% |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Amended, Percentage |  |  | 9.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Mill Creek Unit 1 Retirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Costs Approved to be Recovered under Retired Asset Recovery Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |
LGE [Member] | Kentucky Public Service Commission [Member] | January 2025 KY Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  | $ 2,000,000 |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  |  |  |  |  | 12 months |  |  | 12 months |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  |  | 9.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  |  | 10.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  |  |  | 14.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 105,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  |  |  | 8.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 58,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Subsequent Event [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity | 9.775% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity for Capital Rate Adjustment Mechanism, Percentage | 9.675% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Subsequent Event [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Subsequent Event [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 59,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
KU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities, Power | MW |  |  |  |  |  |  |  |  |  |  |  | 645 |  |  |  |  |  |  |
CPCN NGCC Generation Unit | MW |  |  |  |  |  | 645 |  |  |  |  |  |  |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity |  |  |  |  |  |  |  |  |  |  |  |  | 9.35% |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Amended, Percentage |  |  | 9.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | January 2025 KY Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |  | $ 7,000,000 |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  |  |  |  |  | 12 months |  |  | 12 months |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  |  | 9.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  |  | 10.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 226,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  |  |  | 11.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 132,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
KU [Member] | Subsequent Event [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity | 9.775% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity for Capital Rate Adjustment Mechanism, Percentage | 9.675% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
KU [Member] | Subsequent Event [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 128,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Transfer from the Storm Fund Balance the RIPUC Directed |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |
Net Present Value of Hold Harmless Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 155,000,000 |  |  |  |
Amount of Hold Harmless Obligation to be Credited to Customers in 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,000,000 |  |  |  |
Amount of Hold Harmless Obligation to be Credited to Customers in 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 81,000,000 |  |  |  |
Winter Bill Credit Approved By the RIPUC |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23.54 |  |  |  |  |
Rhode Island Energy | Federal Energy Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial minimum base ROE to be reset by the FERC |  |  |  |  |  |  |  |  | 11.14% |  |  |  |  |  |  |  |  |  |
Minimum base ROE reset by FERC |  |  |  |  |  |  |  |  | 10.57% |  |  |  |  |  |  |  |  |  |
New ROE proposed by NETO and approved by FERC |  |  |  |  |  |  |  | 10.41% |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Federal Energy Regulatory Commission | Maximum ROE authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity |  |  |  |  |  |  |  |  | 11.74% |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity |  | 10.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Approved Spend on FY 2026 Gas ISR Plan |  |  |  |  |  |  |  |  |  |  | $ 165,000,000 |  |  |  |  |  |  |  |
Total Spend on FY 2027 Gas ISR Plan |  |  |  |  |  |  |  |  |  | $ 184,000,000 |  |  |  |  |  |  |  |  |
Capital Investment Spend on FY 2027 Electric ISR Plan |  |  |  |  |  |  |  |  |  | 154,000,000 |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | AMF Capital Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Investment Spend on FY 2027 Electric ISR Plan |  |  |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Vegetation Management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Spend on FY 2027 Electric ISR Plan |  |  |  |  |  |  |  |  |  | 13,000,000 |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Capital Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Spend on FY 2027 Gas ISR Plan |  |  |  |  |  |  |  |  |  | 166,000,000 |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Paving Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Spend on FY 2027 Gas ISR Plan |  |  |  |  |  |  |  |  |  | 17,000,000 |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Paving Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Approved Spend on FY 2026 Gas ISR Plan |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Capital Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Approved Spend on FY 2026 Gas ISR Plan |  |  |  |  |  |  |  |  |  |  | 147,000,000 |  |  |  |  |  |  |  |
Approved Contingency Plan Spend on FY 2026 Gas ISR Plan |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | AMF Capital Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  |  |  |  |  |  |  |  | 88,000,000 |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Vegetation Management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  |  |  |  |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Other O&M |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Capital Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Capital Investment Spend on FY 2026 Electric ISR Plan |  |  |  |  |  |  |  |  |  |  | $ 219,000,000 |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Gas Rates [Member] | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing |  | $ 115,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  | 36.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Gas Rates [Member] | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing |  | $ 32,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  | 7.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Electric And Gas Rates [Member] | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing |  | $ 181,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Electric And Gas Rates [Member] | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing |  | 49,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Electric Rates [Member] | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing |  | $ 66,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  | 18.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Electric Rates [Member] | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dollar amount requested increase in base rates with anticipated rate case filing |  | $ 17,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  | 3.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | $ 725,000,000 |  |  | $ 725,000,000 |  |  |  |  | 673,000,000 |
Distribution System Improvement Charge Cap |  |  |  |  |  | 5.00% |  |  |  | 5.00% |  |  | 5.00% |  |  | 7.50% |  |  |
PPL Electric Utilities Corp [Member] | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | $ 42,000,000 |  |  | $ 42,000,000 |  |  |  |  | 22,000,000 |
PPL Electric Utilities Corp [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  | 2,000,000 |  |  |  |  | 2,000,000 |
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested Distribution System Improvement Charge Cap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00%
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility 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 |  |  |  | $ 356,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  |  | 8.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity |  |  |  | 11.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount Already Included In Customer Bills |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities, Power | MW |  |  |  |  |  |  |  |  |  |  |  | 645 |  |  |  |  |  |  |
New NGCC LG&E Planned Ownership Percentage |  |  |  |  |  |  | 0.31 |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 482,000,000 |  |  | 482,000,000 |  |  |  |  | 491,000,000 |
CPCN NGCC Generation Unit | MW |  |  |  |  |  | 645 |  |  |  |  |  |  |  |  |  |  |  |  |
BESS LG&E Planned Ownership Percentage |  |  |  |  |  | 32.00% |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN Battery Storage Facility | MW |  |  |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Mill Creek Unit 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation or Processing |  |  |  |  |  |  |  |  |  | 199,000,000 |  |  | 199,000,000 |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 24,000,000 |  |  | 24,000,000 |  |  |  |  | 20,000,000 |
Louisville Gas And Electric Co [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  | $ 6,000,000 |  |  |  |  | 4,000,000 |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity |  |  |  |  |  |  |  |  |  |  |  |  | 9.35% |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Amended, Percentage |  |  | 9.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Mill Creek Unit 1 Retirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Costs Approved to be Recovered under Retired Asset Recovery Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | January 2025 KY Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  | $ 2,000,000 |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  |  |  |  |  | 12 months |  |  | 12 months |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  |  | 9.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  |  | 10.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  |  |  | 14.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 105,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  |  |  | 8.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 58,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Subsequent Event [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity | 9.775% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity for Capital Rate Adjustment Mechanism, Percentage | 9.675% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Subsequent Event [Member] | Kentucky Public Service Commission [Member] | Gas Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Subsequent Event [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 59,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN NGCC Combustion Turbine Facilities, Power | MW |  |  |  |  |  |  |  |  |  |  |  | 645 |  |  |  |  |  |  |
New NGCC KU Planned Ownership Percentage |  |  |  |  |  |  | 0.69 |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | $ 467,000,000 |  |  | $ 467,000,000 |  |  |  |  | 458,000,000 |
CPCN NGCC Generation Unit | MW |  |  |  |  |  | 645 |  |  |  |  |  |  |  |  |  |  |  |  |
BESS KU Planned Ownership Percentage |  |  |  |  |  | 68.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 38,000,000 |  |  | 38,000,000 |  |  |  |  | 29,000,000 |
Kentucky Utilities Co [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  | $ 11,000,000 |  |  |  |  | $ 8,000,000 |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity |  |  |  |  |  |  |  |  |  |  |  |  | 9.35% |  |  |  |  |  |
Requested return on equity |  |  |  |  | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Amended, Percentage |  |  | 9.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | January 2025 KY Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Regulatory Costs Not yet Approved |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |  | $ 7,000,000 |  |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period for the deferred recovery of a regulatory asset |  |  |  |  |  |  |  |  |  | 12 months |  |  | 12 months |  |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  |  | 9.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  |  | 10.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 226,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  |  |  | 11.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 132,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Subsequent Event [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity | 9.775% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity for Capital Rate Adjustment Mechanism, Percentage | 9.675% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Subsequent Event [Member] | Kentucky Public Service Commission [Member] | Electric Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 128,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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