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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