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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($)
$ in Millions
48 Months Ended 72 Months Ended
Dec. 31, 2024
Dec. 31, 2022
Jul. 10, 2023
Dec. 31, 2021
Dec. 31, 2020
Regulatory Assets [Line Items]          
Regulatory Assets       $ 9,520 $ 9,987
Current regulatory assets       1,296 1,228
Noncurrent regulatory assets       8,224 8,759
Pension and Other Postretirement Plans Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       2,409 3,010
Pension and Post Retirement Plan Merger Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       893 1,014
Deferred income taxes          
Regulatory Assets [Line Items]          
Regulatory Assets       883 715
Advanced Metering Infrastructure Deployment Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       145 174
Advanced Metering Infrastructure Legacy Meter Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       186 219
Electric Distribution Formula Rate Annual Reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       44 (14)
Electric Distribution Formula Rate One-time Events [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       104 117
Energy Efficiency Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       1,181 982
Fair value of long-term debt          
Regulatory Assets [Line Items]          
Regulatory Assets       557 598
Fair value of PHI's unamortized energy contracts          
Regulatory Assets [Line Items]          
Regulatory Assets       236 328
Asset retirement obligations          
Regulatory Assets [Line Items]          
Regulatory Assets       145 135
MGP remediation costs          
Regulatory Assets [Line Items]          
Regulatory Assets       283 285
Renewable Energy Program [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       219 301
Electric energy and natural gas costs          
Regulatory Assets [Line Items]          
Regulatory Assets       96 95
Transmission formula rate annual reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       43 5
Energy efficiency and demand response programs          
Regulatory Assets [Line Items]          
Regulatory Assets       564 572
Under-recovered revenue decoupling          
Regulatory Assets [Line Items]          
Regulatory Assets       157 113
Stranded costs          
Regulatory Assets [Line Items]          
Regulatory Assets         25
Removal costs          
Regulatory Assets [Line Items]          
Regulatory Assets       758 701
DC PLUG charge          
Regulatory Assets [Line Items]          
Regulatory Assets       70 100
Deferred storm costs          
Regulatory Assets [Line Items]          
Regulatory Assets       49 50
COVID-19 Regulatory Asset          
Regulatory Assets [Line Items]          
Regulatory Assets       82 81
Under-Recovered Credit Loss Expense          
Regulatory Assets [Line Items]          
Regulatory Assets       89 107
Other          
Regulatory Assets [Line Items]          
Regulatory Assets       327 274
Commonwealth Edison Co [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       2,205 2,028
Current regulatory assets       335 279
Noncurrent regulatory assets       1,870 1,749
Commonwealth Edison Co [Member] | Pension and Other Postretirement Plans Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Pension and Post Retirement Plan Merger Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Deferred income taxes          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Advanced Metering Infrastructure Deployment Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       69 90
Commonwealth Edison Co [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       44 (14)
Commonwealth Edison Co [Member] | Electric Distribution Formula Rate One-time Events [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       104 117
Commonwealth Edison Co [Member] | Energy Efficiency Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       1,181 982
Commonwealth Edison Co [Member] | Fair value of long-term debt          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Fair value of PHI's unamortized energy contracts          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Asset retirement obligations          
Regulatory Assets [Line Items]          
Regulatory Assets       99 92
Commonwealth Edison Co [Member] | MGP remediation costs          
Regulatory Assets [Line Items]          
Regulatory Assets       266 271
Commonwealth Edison Co [Member] | Renewable Energy Program [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       219 301
Commonwealth Edison Co [Member] | Electric energy and natural gas costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Transmission formula rate annual reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Energy efficiency and demand response programs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Under-recovered revenue decoupling          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Stranded costs          
Regulatory Assets [Line Items]          
Regulatory Assets         0
Commonwealth Edison Co [Member] | Removal costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | DC PLUG charge          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | Deferred storm costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Commonwealth Edison Co [Member] | COVID-19 Regulatory Asset          
Regulatory Assets [Line Items]          
Regulatory Assets       28 22
Commonwealth Edison Co [Member] | Under-Recovered Credit Loss Expense          
Regulatory Assets [Line Items]          
Regulatory Assets       60 89
Commonwealth Edison Co [Member] | Other          
Regulatory Assets [Line Items]          
Regulatory Assets       135 78
PECO Energy Co [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       991 801
Current regulatory assets       48 25
Noncurrent regulatory assets       943 776
PECO Energy Co [Member] | Pension and Other Postretirement Plans Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Pension and Post Retirement Plan Merger Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Deferred income taxes          
Regulatory Assets [Line Items]          
Regulatory Assets       873 705
PECO Energy Co [Member] | Advanced Metering Infrastructure Deployment Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Electric Distribution Formula Rate One-time Events [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Energy Efficiency Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Fair value of long-term debt          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Fair value of PHI's unamortized energy contracts          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Asset retirement obligations          
Regulatory Assets [Line Items]          
Regulatory Assets       21 21
PECO Energy Co [Member] | MGP remediation costs          
Regulatory Assets [Line Items]          
Regulatory Assets       8 10
PECO Energy Co [Member] | Renewable Energy Program [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Electric energy and natural gas costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Transmission formula rate annual reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       14 0
PECO Energy Co [Member] | Energy efficiency and demand response programs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Under-recovered revenue decoupling          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Stranded costs          
Regulatory Assets [Line Items]          
Regulatory Assets         0
PECO Energy Co [Member] | Removal costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | DC PLUG charge          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Deferred storm costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | COVID-19 Regulatory Asset          
Regulatory Assets [Line Items]          
Regulatory Assets       33 38
PECO Energy Co [Member] | Under-Recovered Credit Loss Expense          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
PECO Energy Co [Member] | Other          
Regulatory Assets [Line Items]          
Regulatory Assets       42 27
Baltimore Gas and Electric Company [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       692 649
Current regulatory assets       215 168
Noncurrent regulatory assets       477 481
Baltimore Gas and Electric Company [Member] | Pension and Other Postretirement Plans Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Pension and Post Retirement Plan Merger Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Deferred income taxes          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Advanced Metering Infrastructure Deployment Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       89 109
Baltimore Gas and Electric Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       29 37
Baltimore Gas and Electric Company [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Electric Distribution Formula Rate One-time Events [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Energy Efficiency Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Fair value of long-term debt          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Fair value of PHI's unamortized energy contracts          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Asset retirement obligations          
Regulatory Assets [Line Items]          
Regulatory Assets       19 18
Baltimore Gas and Electric Company [Member] | MGP remediation costs          
Regulatory Assets [Line Items]          
Regulatory Assets       9 4
Baltimore Gas and Electric Company [Member] | Renewable Energy Program [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Electric energy and natural gas costs          
Regulatory Assets [Line Items]          
Regulatory Assets       49 23
Baltimore Gas and Electric Company [Member] | Transmission formula rate annual reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       1 2
Baltimore Gas and Electric Company [Member] | Energy efficiency and demand response programs          
Regulatory Assets [Line Items]          
Regulatory Assets       283 289
Baltimore Gas and Electric Company [Member] | Under-recovered revenue decoupling          
Regulatory Assets [Line Items]          
Regulatory Assets       32 20
Baltimore Gas and Electric Company [Member] | Stranded costs          
Regulatory Assets [Line Items]          
Regulatory Assets         0
Baltimore Gas and Electric Company [Member] | Removal costs          
Regulatory Assets [Line Items]          
Regulatory Assets       143 107
Baltimore Gas and Electric Company [Member] | DC PLUG charge          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Deferred storm costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | COVID-19 Regulatory Asset          
Regulatory Assets [Line Items]          
Regulatory Assets       8 10
Baltimore Gas and Electric Company [Member] | Under-Recovered Credit Loss Expense          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Baltimore Gas and Electric Company [Member] | Other          
Regulatory Assets [Line Items]          
Regulatory Assets       30 30
Baltimore Gas and Electric Company [Member] | Difference between Carrying Value and Fair Value [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       114 120
Pepco Holdings LLC [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       2,226 2,373
Current regulatory assets       432 440
Noncurrent regulatory assets       1,794 1,933
Pepco Holdings LLC [Member] | Pension and Other Postretirement Plans Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Pepco Holdings LLC [Member] | Pension and Post Retirement Plan Merger Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Pepco Holdings LLC [Member] | Deferred income taxes          
Regulatory Assets [Line Items]          
Regulatory Assets       10 10
Pepco Holdings LLC [Member] | Advanced Metering Infrastructure Deployment Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       56 65
Pepco Holdings LLC [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       88 92
Pepco Holdings LLC [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Pepco Holdings LLC [Member] | Electric Distribution Formula Rate One-time Events [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Pepco Holdings LLC [Member] | Energy Efficiency Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Pepco Holdings LLC [Member] | Fair value of long-term debt          
Regulatory Assets [Line Items]          
Regulatory Assets       443 478
Pepco Holdings LLC [Member] | Fair value of PHI's unamortized energy contracts          
Regulatory Assets [Line Items]          
Regulatory Assets       236 328
Pepco Holdings LLC [Member] | Asset retirement obligations          
Regulatory Assets [Line Items]          
Regulatory Assets       6 4
Pepco Holdings LLC [Member] | MGP remediation costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Pepco Holdings LLC [Member] | Renewable Energy Program [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Pepco Holdings LLC [Member] | Electric energy and natural gas costs          
Regulatory Assets [Line Items]          
Regulatory Assets       47 72
Pepco Holdings LLC [Member] | Transmission formula rate annual reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       28 3
Pepco Holdings LLC [Member] | Energy efficiency and demand response programs          
Regulatory Assets [Line Items]          
Regulatory Assets       281 283
Pepco Holdings LLC [Member] | Under-recovered revenue decoupling          
Regulatory Assets [Line Items]          
Regulatory Assets       125 93
Pepco Holdings LLC [Member] | Stranded costs          
Regulatory Assets [Line Items]          
Regulatory Assets         25
Pepco Holdings LLC [Member] | Removal costs          
Regulatory Assets [Line Items]          
Regulatory Assets       615 594
Pepco Holdings LLC [Member] | DC PLUG charge          
Regulatory Assets [Line Items]          
Regulatory Assets       70 100
Pepco Holdings LLC [Member] | Deferred storm costs          
Regulatory Assets [Line Items]          
Regulatory Assets       49 50
Pepco Holdings LLC [Member] | COVID-19 Regulatory Asset          
Regulatory Assets [Line Items]          
Regulatory Assets       13 11
Pepco Holdings LLC [Member] | Under-Recovered Credit Loss Expense          
Regulatory Assets [Line Items]          
Regulatory Assets       29 18
Pepco Holdings LLC [Member] | Other          
Regulatory Assets [Line Items]          
Regulatory Assets       130 147
Pepco Holdings LLC [Member] | Difference between Carrying Value and Fair Value [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       443 478
Potomac Electric Power Company [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       745 784
Current regulatory assets       213 214
Noncurrent regulatory assets       532 570
Potomac Electric Power Company [Member] | Forecast [Member]          
Regulatory Assets [Line Items]          
Proposed Capital Expenditure     $ 500    
Potomac Electric Power Company [Member] | Pension and Other Postretirement Plans Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Pension and Post Retirement Plan Merger Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Deferred income taxes          
Regulatory Assets [Line Items]          
Regulatory Assets       10 10
Potomac Electric Power Company [Member] | Advanced Metering Infrastructure Deployment Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       30 35
Potomac Electric Power Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       60 68
Potomac Electric Power Company [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Electric Distribution Formula Rate One-time Events [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Energy Efficiency Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Fair value of long-term debt          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Fair value of PHI's unamortized energy contracts          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Asset retirement obligations          
Regulatory Assets [Line Items]          
Regulatory Assets       5 3
Potomac Electric Power Company [Member] | MGP remediation costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Renewable Energy Program [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Electric energy and natural gas costs          
Regulatory Assets [Line Items]          
Regulatory Assets       29 37
Potomac Electric Power Company [Member] | Transmission formula rate annual reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Energy efficiency and demand response programs          
Regulatory Assets [Line Items]          
Regulatory Assets       199 203
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling          
Regulatory Assets [Line Items]          
Regulatory Assets       125 93
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling | MARYLAND | 2022          
Regulatory Assets [Line Items]          
Regulatory Assets       22  
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling | DISTRICT OF COLUMBIA          
Regulatory Assets [Line Items]          
Regulatory Assets       103  
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling | DISTRICT OF COLUMBIA | 2024          
Regulatory Assets [Line Items]          
Regulatory Assets       66  
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling | DISTRICT OF COLUMBIA | 2028          
Regulatory Assets [Line Items]          
Regulatory Assets       37  
Potomac Electric Power Company [Member] | Stranded costs          
Regulatory Assets [Line Items]          
Regulatory Assets         0
Potomac Electric Power Company [Member] | Removal costs          
Regulatory Assets [Line Items]          
Regulatory Assets       147 151
Potomac Electric Power Company [Member] | DC PLUG charge          
Regulatory Assets [Line Items]          
Regulatory Assets       70 100
Potomac Electric Power Company [Member] | DC PLUG charge | Forecast [Member]          
Regulatory Assets [Line Items]          
Proposed Capital Expenditure     250    
Potomac Electric Power Company [Member] | DC PLUG charge | Forecast [Member] | DISTRICT OF COLUMBIA          
Regulatory Assets [Line Items]          
Proposed Capital Expenditure     $ 250    
Potomac Electric Power Company [Member] | Deferred storm costs          
Regulatory Assets [Line Items]          
Regulatory Assets       3 5
Potomac Electric Power Company [Member] | COVID-19 Regulatory Asset          
Regulatory Assets [Line Items]          
Regulatory Assets       10 7
Potomac Electric Power Company [Member] | COVID-19 Regulatory Asset | MARYLAND          
Regulatory Assets [Line Items]          
Regulatory Assets       1  
Potomac Electric Power Company [Member] | COVID-19 Regulatory Asset | MARYLAND | 2026          
Regulatory Assets [Line Items]          
Regulatory Assets       1  
Potomac Electric Power Company [Member] | COVID-19 Regulatory Asset | DISTRICT OF COLUMBIA          
Regulatory Assets [Line Items]          
Regulatory Assets       8  
Potomac Electric Power Company [Member] | Under-Recovered Credit Loss Expense          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Potomac Electric Power Company [Member] | Other          
Regulatory Assets [Line Items]          
Regulatory Assets       57 72
Delmarva Power & Light Company [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       280 280
Current regulatory assets       68 58
Noncurrent regulatory assets       212 222
Delmarva Power & Light Company [Member] | Pension and Other Postretirement Plans Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Pension and Post Retirement Plan Merger Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Deferred income taxes          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Advanced Metering Infrastructure Deployment Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       26 30
Delmarva Power & Light Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       21 24
Delmarva Power & Light Company [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Electric Distribution Formula Rate One-time Events [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Energy Efficiency Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Fair value of long-term debt          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Fair value of PHI's unamortized energy contracts          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Asset retirement obligations          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | MGP remediation costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Renewable Energy Program [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Electric energy and natural gas costs          
Regulatory Assets [Line Items]          
Regulatory Assets       13 5
Delmarva Power & Light Company [Member] | Transmission formula rate annual reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       8 2
Delmarva Power & Light Company [Member] | Energy efficiency and demand response programs          
Regulatory Assets [Line Items]          
Regulatory Assets       79 80
Delmarva Power & Light Company [Member] | Under-recovered revenue decoupling          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Stranded costs          
Regulatory Assets [Line Items]          
Regulatory Assets         0
Delmarva Power & Light Company [Member] | Removal costs          
Regulatory Assets [Line Items]          
Regulatory Assets       109 105
Delmarva Power & Light Company [Member] | DC PLUG charge          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Deferred storm costs          
Regulatory Assets [Line Items]          
Regulatory Assets       3 4
Delmarva Power & Light Company [Member] | Deferred storm costs | 2025          
Regulatory Assets [Line Items]          
Regulatory Assets       1  
Delmarva Power & Light Company [Member] | Deferred storm costs | MARYLAND          
Regulatory Assets [Line Items]          
Regulatory Assets       2  
Delmarva Power & Light Company [Member] | COVID-19 Regulatory Asset          
Regulatory Assets [Line Items]          
Regulatory Assets       3 4
Delmarva Power & Light Company [Member] | COVID-19 Regulatory Asset | MARYLAND          
Regulatory Assets [Line Items]          
Regulatory Assets       1  
Delmarva Power & Light Company [Member] | COVID-19 Regulatory Asset | DELAWARE          
Regulatory Assets [Line Items]          
Regulatory Assets       2  
Delmarva Power & Light Company [Member] | Under-Recovered Credit Loss Expense          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Delmarva Power & Light Company [Member] | Other          
Regulatory Assets [Line Items]          
Regulatory Assets       18 26
Atlantic City Electric Company [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       491 470
Current regulatory assets       61 75
Noncurrent regulatory assets       430 395
Proposed Capital Expenditure $ 220        
Atlantic City Electric Company [Member] | Forecast [Member]          
Regulatory Assets [Line Items]          
Proposed Capital Expenditure   $ 338      
Atlantic City Electric Company [Member] | Pension and Other Postretirement Plans Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Pension and Post Retirement Plan Merger Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Deferred income taxes          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Advanced Metering Infrastructure Deployment Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       7 0
Atlantic City Electric Company [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Electric Distribution Formula Rate One-time Events [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Energy Efficiency Costs [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Fair value of long-term debt          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Fair value of PHI's unamortized energy contracts          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Asset retirement obligations          
Regulatory Assets [Line Items]          
Regulatory Assets       1 1
Atlantic City Electric Company [Member] | MGP remediation costs          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Renewable Energy Program [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Electric energy and natural gas costs          
Regulatory Assets [Line Items]          
Regulatory Assets       5 30
Atlantic City Electric Company [Member] | Transmission formula rate annual reconciliations [Member]          
Regulatory Assets [Line Items]          
Regulatory Assets       20 1
Atlantic City Electric Company [Member] | Energy efficiency and demand response programs          
Regulatory Assets [Line Items]          
Regulatory Assets       3 0
Atlantic City Electric Company [Member] | Under-recovered revenue decoupling          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Stranded costs          
Regulatory Assets [Line Items]          
Regulatory Assets         25
Atlantic City Electric Company [Member] | Removal costs          
Regulatory Assets [Line Items]          
Regulatory Assets       360 339
Atlantic City Electric Company [Member] | DC PLUG charge          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Deferred storm costs          
Regulatory Assets [Line Items]          
Regulatory Assets       43 41
Atlantic City Electric Company [Member] | Deferred storm costs | 2024          
Regulatory Assets [Line Items]          
Regulatory Assets       36  
Atlantic City Electric Company [Member] | Deferred storm costs | NEW JERSEY          
Regulatory Assets [Line Items]          
Regulatory Assets       7  
Atlantic City Electric Company [Member] | COVID-19 Regulatory Asset          
Regulatory Assets [Line Items]          
Regulatory Assets       0 0
Atlantic City Electric Company [Member] | Under-Recovered Credit Loss Expense          
Regulatory Assets [Line Items]          
Regulatory Assets       29 18
Atlantic City Electric Company [Member] | Other          
Regulatory Assets [Line Items]          
Regulatory Assets       $ 23 $ 15