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Utility Rate Regulation - Regulatory Matters (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 16, 2018
Aug. 24, 2018
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2014
Dec. 31, 2021
PPL Electric [Member]                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                
Regulatory Liability due to ROE Reserve, After Tax       $ 17   $ 36    
Regulatory Liability due to ROE Reserve, Before Tax               $ 73
Amortization of Revenue Reserve for ROE Challenge     $ 30   $ 74      
PPL Electric [Member] | Period of 05-21-2020 to 12-31-2020                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                
Regulatory Liability due to ROE Reserve, After Tax       7   13    
Rhode Island Energy | Rhode Island Public Uitilty Commsion                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                
Public Utilities, Approved Return on Equity, Percentage   9.275%            
Rhode Island Energy | Rhode Island Public Uitilty Commsion | Common equity percentage related to approved rate                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                
Percentage of common equity used on allowed ROE   51.00%            
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 | Federal Energy Regulatory Commsion [Member] | Amount remitted on the authorized ROE                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                
Amount of ROE remitted by NEP     14   $ 14      
PPL Electric Utilities Corp [Member]                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                
Regulatory Liability due to ROE Reserve, After Tax       17   36    
Regulatory Liability due to ROE Reserve, Before Tax               $ 73
Amortization of Revenue Reserve for ROE Challenge     $ 30   $ 74      
PPL Electric Utilities Corp [Member] | Period of 05-21-2020 to 12-31-2020                
Regulatory Matters - Rate Case Proceedings (Numeric) [Abstract]                
Regulatory Liability due to ROE Reserve, After Tax       $ 7   $ 13