Leases - Types of Leases (Details)	12 Months Ended
	Dec. 31, 2023
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	3 years
Option to terminate within, Lessee, Operating Lease	9 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	82 years
Options to extend the term, Lessee, Operating Lease	30 years
Option to terminate within, Lessee, Operating Lease	9 years
Real Estate
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Vehicles
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Commonwealth Edison Co | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	N/A years
Option to terminate within, Lessee, Operating Lease	N/A years
Commonwealth Edison Co | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	29 years
Options to extend the term, Lessee, Operating Lease	N/A years
Option to terminate within, Lessee, Operating Lease	N/A years
Commonwealth Edison Co | Real Estate
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Commonwealth Edison Co | Vehicles
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description
PECO Energy Co | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
PECO Energy Co | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	10 years
PECO Energy Co | Real Estate
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
PECO Energy Co | Vehicles
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description
Baltimore Gas and Electric Company | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	3 years
Option to terminate within, Lessee, Operating Lease	N/A years
Baltimore Gas and Electric Company | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	82 years
Options to extend the term, Lessee, Operating Lease	5 years
Option to terminate within, Lessee, Operating Lease	N/A years
Baltimore Gas and Electric Company | Real Estate
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Baltimore Gas and Electric Company | Vehicles
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Pepco Holdings LLC | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	3 years
Pepco Holdings LLC | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	8 years
Options to extend the term, Lessee, Operating Lease	30 years
Pepco Holdings LLC | Real Estate
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Pepco Holdings LLC | Vehicles
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Potomac Electric Power Company | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	5 years
Potomac Electric Power Company | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	8 years
Options to extend the term, Lessee, Operating Lease	5 years
Potomac Electric Power Company | Real Estate
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Potomac Electric Power Company | Vehicles
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Delmarva Power & Light Company | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	3 years
Delmarva Power & Light Company | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	8 years
Options to extend the term, Lessee, Operating Lease	30 years
Delmarva Power & Light Company | Real Estate
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Delmarva Power & Light Company | Vehicles
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Atlantic City Electric Company | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	5 years
Atlantic City Electric Company | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	7 years
Options to extend the term, Lessee, Operating Lease	5 years
Atlantic City Electric Company | Real Estate
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Atlantic City Electric Company | Vehicles
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●