Regulatory Matters - Schedule of Pending Rate Cases (Details) - USD ($)	Apr. 26, 2024	Mar. 28, 2024	Mar. 15, 2024	Feb. 27, 2024	Feb. 23, 2024
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			$ 670,000,000
Requested Return on Equity, Percentage			8.905%
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2024
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			$ 302,000,000
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			89,000,000
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2026
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			136,000,000
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2027
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			$ 143,000,000
Commonwealth Edison Co | Illinois 2024 Electric Distribution Reconciliation Rate Case | Subsequent Event [Member]
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation	$ 627,000,000
Requested Return on Equity, Percentage	9.89%
PECO Energy Co | Pennsylvania 2024 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)		$ 464,000,000
Requested Return on Equity, Percentage		10.95%
PECO Energy Co | Pennsylvania 2024 Electric Distribution Base Rate Case | 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)		$ (64,000,000)
PECO Energy Co | Pennsylvania 2023 Natural Gas Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)		$ 111,000,000
Requested Return on Equity, Percentage		11.15%
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease), Amended				$ 186,000,000
Requested Return on Equity, Percentage				10.50%
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case | 2024
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				$ 116,000,000
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case | 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				35,000,000
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case | 2026
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				$ 35,000,000
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease), Amended					$ 186,000,000
Requested Return on Equity, Percentage					10.50%
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2024
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)					$ 68,000,000
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)					53,000,000
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2026
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)					51,000,000
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2027
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)					$ 14,000,000