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Retirement Benefits - Allocated Portion of Pension and Postretirement Benefit Plan Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs     $ 181 $ 152
Pension and other post retirement benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs $ 61 $ 63 181 152
Commonwealth Edison Co        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs     53 19
Commonwealth Edison Co | Pension and other post retirement benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs 17 6 53 19
PECO Energy Co        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs     (1) (10)
PECO Energy Co | Pension and other post retirement benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs (1) (3) (1) (10)
Baltimore Gas and Electric Company        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs     45 41
Baltimore Gas and Electric Company | Pension and other post retirement benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs 14 14 45 42
Pepco Holdings LLC        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs     71 74
Pepco Holdings LLC | Pension and other post retirement benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs 25 25 71 74
Potomac Electric Power Company        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs     24 26
Potomac Electric Power Company | Pension and other post retirement benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs 8 9 24 26
Delmarva Power and Light Company        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs     11 13
Delmarva Power and Light Company | Pension and other post retirement benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs 4 4 11 13
Atlantic City Electric Company        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs     10 10
Atlantic City Electric Company | Pension and other post retirement benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefits Costs $ 3 $ 3 $ 10 $ 10