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Supplemental Financial Information - Operations (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Other, Net [Abstract]        
AFUDC - Equity $ 38 $ 40 $ 116 $ 113
Non-service net periodic benefit cost (13) (18) (29) (18)
Commonwealth Edison Co        
Other, Net [Abstract]        
AFUDC - Equity 13 7 32 25
Non-service net periodic benefit cost 0 0 0 0
PECO Energy Co        
Other, Net [Abstract]        
AFUDC - Equity 7 10 24 22
Non-service net periodic benefit cost 0 0 0 0
Baltimore Gas and Electric Company        
Other, Net [Abstract]        
AFUDC - Equity 5 4 18 11
Non-service net periodic benefit cost 0 0 0 0
Pepco Holdings LLC        
Other, Net [Abstract]        
AFUDC - Equity 12 19 42 55
Non-service net periodic benefit cost 0 0 0 0
Potomac Electric Power Company        
Other, Net [Abstract]        
AFUDC - Equity 8 15 32 42
Non-service net periodic benefit cost 0 0 0 0
Delmarva Power and Light Company        
Other, Net [Abstract]        
AFUDC - Equity 3 3 9 7
Non-service net periodic benefit cost 0 0 0 0
Atlantic City Electric Company        
Other, Net [Abstract]        
AFUDC - Equity 1 1 1 6
Non-service net periodic benefit cost $ 0 $ 0 $ 0 $ 0