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Utility Rate Regulation (Regulatory Matters) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 26, 2024
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Nov. 06, 2023
Sep. 27, 2023
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Oct. 16, 2018
Dec. 31, 2024
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Dec. 31, 2023
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Dec. 31, 2022
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Mar. 31, 2015
Dec. 31, 2024
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Dec. 31, 2023
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Jan. 31, 2025
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Oct. 04, 2024
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Apr. 26, 2024
Apr. 25, 2024
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Nov. 21, 2023
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Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         $ 2,060 $ 1,874     $ 2,060 $ 1,874          
Storm Costs [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         113 97     113 97          
Other [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         $ 41 43     $ 41 43          
PPL Electric [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Act 129 Recovery Period Under Phase IV Plan                 5 years            
Billing Issues, Expenses Incurred                 $ 18 34          
Distribution System Improvement Charge Cap         5.00%       5.00%            
PPL Electric [Member] | Pennsylvania Public Utility Commission [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
PPL Electric Billing Issue, Donation to be Paid                           $ 1  
PPL Electric Billing Issue, Civil Penalty to be Paid                             $ 1
Requested Distribution System Improvement Charge Cap                         9.00%    
LGE [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
CPCN NGCC Combustion Turbine Facilities, Power | MW             640                
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         $ 221       $ 221            
Public Utilities, Property, Plant and Equipment, Generation, Expected Remaining Book Value at Retirement         161       $ 161            
LGE [Member] | Kentucky Public Service Commission [Member]                              
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]                              
Return on equity                 9.35%            
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 Regulatory Costs Not yet Approved                       $ 125      
LGE [Member] | Kentucky Public Service Commission [Member] | Storm Costs [Member] | September 2024 KY Storm                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         2       $ 2            
LGE [Member] | Kentucky Public Service Commission [Member] | Storm Costs [Member] | May 2024 KY Storm                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         $ 4       $ 4            
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] | Subsequent Event [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        
KU [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
CPCN NGCC Combustion Turbine Facilities, Power | MW             640                
KU [Member] | Kentucky Public Service Commission [Member]                              
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]                              
Return on equity                 9.35%            
KU [Member] | Kentucky Public Service Commission [Member] | Storm Costs [Member] | September 2024 KY Storm                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         $ 11       $ 11            
KU [Member] | Kentucky Public Service Commission [Member] | Storm Costs [Member] | May 2024 KY Storm                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         $ 5       $ 5            
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] | Subsequent Event [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                     8        
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%                      
Maximum Base ROE reset by FERC               11.74%              
Rhode Island Energy | Federal Energy Regulatory Commission | Maximum ROE authorized                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
FERC Granted ROE                 11.74%            
Rhode Island Energy | Rhode Island Public Uitilty Commsion                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Recovery Cap on Capital Investment Related to AMF Program     $ 153                        
Capital Investment Spend on FY 2025 Gas ISR Plan           185                  
Contingency Plan Spend on FY 2025 Gas ISR Plan           11                  
Capital Investment Spend on FY 2025 Electric ISR Plan           141                  
Total Approved Spend on FY 2025 Gas ISR Plan $ 180                            
Approved Contingency Plan Spend on FY 2025 Gas ISR Plan 11                            
Capital Investment Spend on FY 2026 Gas ISR Plan         $ 187                    
Capital Investment Spend on FY 2026 Electric ISR Plan         160                    
Contingency Plan Spend on FY 2026 Gas ISR Plan         15                    
Total Capital Investment Spend on FY 2026 Electric ISR Plan         248                    
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Paving Costs                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Capital Investment Spend on FY 2026 Gas ISR Plan                 $ 22            
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 2025 Electric ISR Plan         88                    
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Vegetation Management                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Capital Investment Spend on FY 2026 Electric ISR Plan         14                    
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Other O&M                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Capital Investment Spend on FY 2026 Electric ISR Plan         1                    
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 2025 Gas ISR Plan 12                            
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 2025 Gas ISR Plan 168                            
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Vegetation Management                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
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 Uitilty Commsion | Other O&M                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
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 Uitilty Commsion | Capital Investment                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Approved Capital Investment Spend on FY 2025 Electric ISR Plan $ 132                            
PPL Electric Utilities Corp [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Act 129 Recovery Period Under Phase IV Plan                 5 years            
Regulatory assets         $ 673 598     $ 673 598          
Billing Issues, Expenses Incurred                 $ 18 34          
Distribution System Improvement Charge Cap         5.00%       5.00%            
PPL Electric Utilities Corp [Member] | Storm Costs [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         $ 22 0     $ 22 0          
PPL Electric Utilities Corp [Member] | Other [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         2 0     2 0          
PPL Electric Utilities Corp [Member] | Pennsylvania Public Utility Commission [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
PPL Electric Billing Issue, Donation to be Paid                           $ 1  
PPL Electric Billing Issue, Civil Penalty to be Paid                             $ 1
Requested Distribution System Improvement Charge Cap                         9.00%    
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             640                
New NGCC LG&E Planned Ownership Percentage   0.31                          
Regulatory assets         491 395     491 395          
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         221       221            
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 Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         20 15     20 15          
Louisville Gas And Electric Co [Member] | Other [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         0 0     $ 0 0          
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%            
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 Regulatory Costs Not yet Approved                       $ 125      
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Storm Costs [Member] | September 2024 KY Storm                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         2       $ 2            
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Storm Costs [Member] | May 2024 KY Storm                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         $ 4       $ 4            
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] | Subsequent Event [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        
Kentucky Utilities Co [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
CPCN NGCC Combustion Turbine Facilities, Power | MW             640                
New NGCC KU Planned Ownership Percentage   0.69                          
Regulatory assets         $ 458 439     $ 458 439          
Kentucky Utilities Co [Member] | Storm Costs [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         29 14     29 14          
Kentucky Utilities Co [Member] | Other [Member]                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         8 $ 7     $ 8 $ 7          
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member]                              
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]                              
Return on equity                 9.35%            
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Storm Costs [Member] | September 2024 KY Storm                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         11       $ 11            
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Storm Costs [Member] | May 2024 KY Storm                              
Regulatory Matters Federal Matters Federal Energy Regulatory Commission Wholesale Formula Rates Numeric [Abstract]                              
Regulatory assets         $ 5       $ 5            
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] | Subsequent Event [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                     $ 8