v3.26.1
Regulatory Matters - Regulatory Assets and Liabilities (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2026
USD ($)
Commonwealth Edison Co  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets $ 223
Increase (Decrease) in Regulatory Liabilities (72)
Commonwealth Edison Co | Nuclear Decommissioning [Member]  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Liabilities 325
Commonwealth Edison Co | Carbon Mitigation Credit rider  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Liabilities (670)
Commonwealth Edison Co | Carbon Mitigation Credit rider  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets 150
PECO Energy Co  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets 151
Increase (Decrease) in Regulatory Liabilities 189
PECO Energy Co | Nuclear Decommissioning [Member]  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Liabilities 200
PECO Energy Co | Deferred Income Tax Charge  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets 102
Baltimore Gas and Electric Company  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets (104)
Increase (Decrease) in Regulatory Liabilities (33)
Baltimore Gas and Electric Company | Deferred Income Tax Charge  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Liabilities (36)
Baltimore Gas and Electric Company | Electric energy and natural gas costs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets (52)
Baltimore Gas and Electric Company | Energy efficiency and demand response programs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets (47)
Potomac Electric Power Company  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets (34)
Increase (Decrease) in Regulatory Liabilities 12
Potomac Electric Power Company | Deferred Income Tax Charge  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Liabilities (17)
Potomac Electric Power Company | Energy efficiency and demand response programs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets (34)
Potomac Electric Power Company | Removal Costs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Liabilities 23
Delmarva Power and Light Company  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets 11
Delmarva Power and Light Company | Electric energy and natural gas costs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets 12
Delmarva Power and Light Company | Energy efficiency and demand response programs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets (17)
Delmarva Power and Light Company | Removal Costs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets 10
Atlantic City Electric Company  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets 11
Increase (Decrease) in Regulatory Liabilities 46
Atlantic City Electric Company | Under/Over Recovered Transmission Costs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Liabilities (10)
Atlantic City Electric Company | Zero Emission Credit  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Liabilities 34
Atlantic City Electric Company | Electric energy and natural gas costs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Liabilities 25
Atlantic City Electric Company | Energy efficiency and demand response programs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets 34
Atlantic City Electric Company | Deferred Storm Costs  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets 23
Atlantic City Electric Company | Under-Recovered Credit Loss Expense  
Regulatory Matters Assets and Liabilities [Line Items]  
Increase (Decrease) in Regulatory Assets $ (38)