v3.25.2
Retirement Benefits - Defined Contribution Savings Plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Savings Plan Employer Contributions $ 30 $ 29 $ 56 $ 51
Commonwealth Edison Co        
Defined Benefit Plan Disclosure [Line Items]        
Savings Plan Employer Contributions 12 10 22 20
PECO Energy Co        
Defined Benefit Plan Disclosure [Line Items]        
Savings Plan Employer Contributions 4 5 8 8
Baltimore Gas and Electric Company        
Defined Benefit Plan Disclosure [Line Items]        
Savings Plan Employer Contributions 3 3 6 6
Pepco Holdings LLC        
Defined Benefit Plan Disclosure [Line Items]        
Savings Plan Employer Contributions 5 6 10 8
Potomac Electric Power Company        
Defined Benefit Plan Disclosure [Line Items]        
Savings Plan Employer Contributions 2 1 3 2
Delmarva Power and Light Company        
Defined Benefit Plan Disclosure [Line Items]        
Savings Plan Employer Contributions 1 1 2 2
Atlantic City Electric Company        
Defined Benefit Plan Disclosure [Line Items]        
Savings Plan Employer Contributions $ 0 $ 1 $ 1 $ 1