v3.26.1
Utility Rate Regulation - Regulatory Matters (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2026
Mar. 05, 2026
Feb. 16, 2026
Nov. 26, 2025
Sep. 30, 2025
Mar. 31, 2026
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2027
Mar. 31, 2027
Dec. 31, 2025
Nov. 24, 2025
Jun. 13, 2025
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Regulatory assets             $ 2,148,000,000     $ 2,148,000,000       $ 2,092,000,000    
Storm Costs [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Regulatory assets             109,000,000     109,000,000       113,000,000    
Kentucky Public Service Commission [Member] | Electric and Gas Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 233,000,000                          
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 233,000,000                          
PPL Electric [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Annual Storm Damage Expense Rider Maximum Prior To Rate Case                   20,000,000            
Annual Storm Damage Expense Rider Maximum Approved in Rate Case                   32,000,000            
PPL Electric [Member] | Unaffiliated Third Party Entity [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Accounts Receivable, Purchase             379,000,000   $ 345,000,000 932,000,000 $ 811,000,000          
PPL Electric [Member] | Pennsylvania Public Utility Commission                                
Regulatory Matters [Line Items]                                
Proposed Total Amount of Low-Income Usage Reduction Program Annual Budget   $ 13,500,000                            
Proposed Amount of Increase to Low-Income Usage Reduction Program Annual Budget   1,500,000                            
Amount of Support for Residential Low-Income Program to be Provided by New Tariff Schedule   $ 11,000,000                            
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Requested Distribution System Improvement Charge Cap   5.00%                            
Public Utilities, Requested Return on Equity, Percentage         11.30%                      
Distribution System Improvement Reset Percent   0.00%                            
Requested Storm Damage Expense Rider Expense   $ 32,000,000                            
Public Utilities, Requested Return on Equity, Percentage         11.30%                      
Requested Storm Damage Expense Rider Expense   $ 32,000,000                            
Distribution System Improvement Reset Percent   0.00%                            
PPL Electric [Member] | Pennsylvania Public Utility Commission | Forecast [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Total Projected Cost of Information Technology Upgrades                       $ 54,000,000        
Total Projected Cost of Information Technology Upgrades                       54,000,000        
PPL Electric [Member] | Pennsylvania Public Utility Commission | Electric Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 275,000,000     $ 356,000,000                      
Public Utilities, Requested Rate Increase (Decrease), Percentage         8.60%                      
Public Utilities, Requested Rate Increase (Decrease), Amount Already Included In Customer Bills         $ 50,000,000                      
Public Utilities, Requested Rate Increase (Decrease), Amount   275,000,000     $ 356,000,000                      
Public Utilities, Requested Rate Increase (Decrease), Percentage         8.60%                      
LGE [Member] | Mill Creek Unit 2                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Property, Plant and Equipment, Generation or Processing             188,000,000     188,000,000            
LGE [Member] | Kentucky Public Service Commission [Member]                                
Regulatory Matters [Line Items]                                
Public Utilities, Approved Return on Equity for Capital Rate Adjustment Mechanism, Percentage     9.675%                          
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Return on Equity, Percentage     9.775%                          
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 59,000,000                          
Public Utilities, Approved Rate Increase (Decrease), Amount     59,000,000                          
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Rate Increase (Decrease), Amount     46,000,000                          
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 46,000,000                          
KU [Member] | Kentucky Public Service Commission [Member]                                
Regulatory Matters [Line Items]                                
Public Utilities, Approved Return on Equity for Capital Rate Adjustment Mechanism, Percentage     9.675%                          
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Return on Equity, Percentage     9.775%                          
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 128,000,000                          
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 128,000,000                          
KU [Member] | Virginia State Corporation Commission | Electric Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Rate Increase (Decrease), Amount $ 19,000,000                              
Public Utilities, Requested Return on Equity, Percentage 10.95%                              
Public Utilities, Requested Rate Increase (Decrease), Amount $ 19,000,000                              
Public Utilities, Requested Return on Equity, Percentage 10.95%                              
Rhode Island Energy                                
Regulatory Matters [Line Items]                                
Estimated Amount of Refund Related to the FERC-Mandated Reduction in ROE               $ 26,000,000                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Net Present Value of Hold Harmless Obligation                               $ 155,000,000
Residential Electric Winter Bill Credit Approved by the RIPUC                             $ 23.54  
Amount of Transfer from the Storm Fund Balance Directed by the RIPUC                             11,000,000  
Net Present Value of Hold Harmless Obligation                               $ 155,000,000
Residential Electric Winter Bill Credit Approved by the RIPUC                             $ 23.54  
Rhode Island Energy | Forecast [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Storm Fund Balance Expected                         $ 0      
Rhode Island Energy | Unaffiliated Third Party Entity [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Accounts Receivable, Purchase             74,000,000   68,000,000 170,000,000 155,000,000          
Rhode Island Energy | Rhode Island Public Utility Commission                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Return on Equity, Percentage       10.75%                        
Public Utilities, Requested Return on Equity, Percentage       10.75%                        
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Total Approved Spend on FY 2027 Gas ISR Plan           $ 161,000,000                    
Total Approved Spend on FY 2027 Gas ISR Plan           161,000,000                    
Rhode Island Energy | Rhode Island Public Utility Commission | Paving Costs                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Total Approved Spend on FY 2027 Gas ISR Plan           17,000,000                    
Total Approved Spend on FY 2027 Gas ISR Plan           17,000,000                    
Rhode Island Energy | Rhode Island Public Utility Commission | AMF Capital Investment                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Approved Capital Investment Spend on FY 2027 Electric ISR Plan           18,000,000                    
Rhode Island Energy | Rhode Island Public Utility Commission | Vegetation management                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Total Approved Spend on FY 2027 Electric ISR Plan           14,000,000                    
Rhode Island Energy | Rhode Island Public Utility Commission | Capital Investment                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Approved Capital Investment Spend on FY 2027 Electric ISR Plan           $ 141,000,000                    
Rhode Island Energy | Rhode Island Public Utility Commission | Electric and Gas Rates | Year 1                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 181,000,000                        
Public Utilities, Requested Rate Increase (Decrease), Amount       181,000,000                        
Rhode Island Energy | Rhode Island Public Utility Commission | Electric and Gas Rates | Year 2                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Rate Increase (Decrease), Amount       49,000,000                        
Public Utilities, Requested Rate Increase (Decrease), Amount       49,000,000                        
Rhode Island Energy | Rhode Island Public Utility Commission | Electric Rates | Year 1                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 66,000,000                        
Public Utilities, Requested Rate Increase (Decrease), Percentage       18.20%                        
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 66,000,000                        
Public Utilities, Requested Rate Increase (Decrease), Percentage       18.20%                        
Rhode Island Energy | Rhode Island Public Utility Commission | Electric Rates | Year 2                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 17,000,000                        
Public Utilities, Requested Rate Increase (Decrease), Percentage       3.60%                        
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 17,000,000                        
Public Utilities, Requested Rate Increase (Decrease), Percentage       3.60%                        
Rhode Island Energy | Rhode Island Public Utility Commission | Gas Rates | Year 1                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 115,000,000                        
Public Utilities, Requested Rate Increase (Decrease), Percentage       36.40%                        
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 115,000,000                        
Public Utilities, Requested Rate Increase (Decrease), Percentage       36.40%                        
Rhode Island Energy | Rhode Island Public Utility Commission | Gas Rates | Year 2                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 32,000,000                        
Public Utilities, Requested Rate Increase (Decrease), Percentage       7.40%                        
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 32,000,000                        
Public Utilities, Requested Rate Increase (Decrease), Percentage       7.40%                        
PPL Electric Utilities Corp [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Regulatory assets             771,000,000     771,000,000       725,000,000    
Annual Storm Damage Expense Rider Maximum Prior To Rate Case                   20,000,000            
Annual Storm Damage Expense Rider Maximum Approved in Rate Case                   32,000,000            
PPL Electric Utilities Corp [Member] | Storm Costs [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Regulatory assets             37,000,000     37,000,000       42,000,000    
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Accounts Receivable, Purchase             379,000,000   $ 345,000,000 932,000,000 $ 811,000,000          
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission                                
Regulatory Matters [Line Items]                                
Proposed Total Amount of Low-Income Usage Reduction Program Annual Budget   13,500,000                            
Proposed Amount of Increase to Low-Income Usage Reduction Program Annual Budget   1,500,000                            
Amount of Support for Residential Low-Income Program to be Provided by New Tariff Schedule   $ 11,000,000                            
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Requested Distribution System Improvement Charge Cap   5.00%                            
Public Utilities, Requested Return on Equity, Percentage         11.30%                      
Distribution System Improvement Reset Percent   0.00%                            
Requested Storm Damage Expense Rider Expense   $ 32,000,000                            
Public Utilities, Requested Return on Equity, Percentage         11.30%                      
Requested Storm Damage Expense Rider Expense   $ 32,000,000                            
Distribution System Improvement Reset Percent   0.00%                            
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission | Forecast [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Total Projected Cost of Information Technology Upgrades                       54,000,000        
Total Projected Cost of Information Technology Upgrades                       $ 54,000,000        
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission | Electric Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 275,000,000     $ 356,000,000                      
Public Utilities, Requested Rate Increase (Decrease), Percentage         8.60%                      
Public Utilities, Requested Rate Increase (Decrease), Amount Already Included In Customer Bills         $ 50,000,000                      
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 275,000,000     $ 356,000,000                      
Public Utilities, Requested Rate Increase (Decrease), Percentage         8.60%                      
Louisville Gas And Electric Co [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Regulatory assets             477,000,000     477,000,000       482,000,000    
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             188,000,000     188,000,000            
Louisville Gas And Electric Co [Member] | Storm Costs [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Regulatory assets             22,000,000     22,000,000       24,000,000    
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member]                                
Regulatory Matters [Line Items]                                
Public Utilities, Approved Return on Equity for Capital Rate Adjustment Mechanism, Percentage     9.675%                          
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Return on Equity, Percentage     9.775%                          
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 59,000,000                          
Public Utilities, Approved Rate Increase (Decrease), Amount     59,000,000                          
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Rate Increase (Decrease), Amount     46,000,000                          
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 46,000,000                          
Kentucky Utilities Co [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Regulatory assets             463,000,000     463,000,000       467,000,000    
Kentucky Utilities Co [Member] | Storm Costs [Member]                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Regulatory assets             $ 34,000,000     $ 34,000,000       $ 38,000,000    
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member]                                
Regulatory Matters [Line Items]                                
Public Utilities, Approved Return on Equity for Capital Rate Adjustment Mechanism, Percentage     9.675%                          
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Return on Equity, Percentage     9.775%                          
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 128,000,000                          
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 128,000,000                          
Kentucky Utilities Co [Member] | Virginia State Corporation Commission | Electric Rates                                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                                
Public Utilities, Requested Rate Increase (Decrease), Amount $ 19,000,000                              
Public Utilities, Requested Return on Equity, Percentage 10.95%                              
Public Utilities, Requested Rate Increase (Decrease), Amount $ 19,000,000                              
Public Utilities, Requested Return on Equity, Percentage 10.95%