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Utility Rate Regulation - Regulatory Matters (Details) $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 30, 2025 USD ($) | Feb. 28, 2025 USD ($) MW | Oct. 16, 2018 | Oct. 16, 2014 | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 13, 2025 USD ($) | Mar. 13, 2025 | Oct. 04, 2024 USD ($) | Apr. 26, 2024
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | $ 2,060 | $ 2,055 |  | $ 2,055 |  |  |  |  |
aggregate projected capital expenditures |  | $ 3,700 |  |  |  |  |  |  |  |  |  |  |  |
Cane Run BESS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
aggregate projected capital expenditures |  | 775 |  |  |  |  |  |  |  |  |  |  |  |
Mill Creek NGCC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
aggregate projected capital expenditures |  | $ 1,400 |  |  |  |  |  |  |  |  |  |  |  |
Storm Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 113 | 114 |  | 114 |  |  |  |  |
Kentucky Public Service Commission [Member] | Electric and Gas Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 391 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 391 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 345 | $ 348 | 811 | $ 767 |  |  |  |
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 |  |  |  |  |  |  | 208 |  | 208 |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation, Expected Remaining Book Value at Retirement |  |  |  |  |  |  | 161 |  | 161 |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |
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] | 2025 KY Storms | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 105 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 8.30% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 105 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 8.30% |  |  |  |  |  |  |  |  |  |  |  |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 14.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 14.00% |  |  |  |  |  |  |  |  |  |  |  |  |
KU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
CPCN NGCC Generation Unit | MW |  | 645 |  |  |  |  |  |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | 2025 KY Storms | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 7 |  | 7 |  |  |  |  |
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 226 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 11.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 226 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 11.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Rhode Island Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Hold Harmless Obligation to be Credited to Customers in 2027 |  |  |  |  |  |  |  |  |  |  | $ 81 |  |  |
Amount of Hold Harmless Obligation to be Credited to Customers in 2026 |  |  |  |  |  |  |  |  |  |  | 74 |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Present Value of Hold Harmless Obligation |  |  |  |  |  |  |  |  |  |  | 155 |  |  |
Net Present Value of Hold Harmless Obligation |  |  |  |  |  |  |  |  |  |  | $ 155 |  |  |
Rhode Island Energy | Unaffiliated Third Party Entity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Purchase |  |  |  |  |  |  | 68 | 44 | $ 155 | 95 |  |  |  |
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 |  |  |  |  |  | 673 | 692 |  | $ 692 |  |  |  |  |
PPL Electric Utilities Corp [Member] | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 22 | 42 |  | 42 |  |  |  |  |
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Purchase |  |  |  |  |  |  | 345 | $ 348 | 811 | $ 767 |  |  |  |
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 | 488 |  | 488 |  |  |  |  |
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 |  |  |  |  |  |  | 208 |  | 208 |  |  |  |  |
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 |  |  |  |  |  | 20 | 24 |  | 24 |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |
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] | 2025 KY Storms | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 105 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 8.30% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 105 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 8.30% |  |  |  |  |  |  |  |  |  |  |  |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 14.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 14.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 458 | 462 |  | 462 |  |  |  |  |
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 |  |  |  |  |  | $ 29 | 37 |  | 37 |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | 2025 KY Storms | Storm Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | $ 7 |  | $ 7 |  |  |  |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 226 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 11.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 226 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 11.50% |  |  |  |  |  |  |  |  |  |  |  |  |

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