Debt and Credit Agreements (All Registrants) - Narrative (Details) - USD ($)			9 Months Ended
	May 09, 2023	Oct. 04, 2022	Sep. 30, 2023	Mar. 24, 2023	Mar. 14, 2023	Jan. 13, 2023	Oct. 07, 2022	Mar. 23, 2017
Corporate, Non-Segment | ShortTermDebt03232017
Short-term Debt [Line Items]
Short-term bank loans and notes payable								$ 500,000,000
Corporate, Non-Segment | ShortTermDebt03232017 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Debt instrument, interest rate terms			0.90%
Corporate, Non-Segment | ShortTermDebt03142023
Short-term Debt [Line Items]
Short-term bank loans and notes payable					$ 300,000,000
Corporate, Non-Segment | ShortTermDebt03242023
Short-term Debt [Line Items]
Short-term bank loans and notes payable				$ 200,000,000
Commonwealth Edison Co | ShortTermDebtSOFRplus075Oct2023
Short-term Debt [Line Items]
Short-term bank loans and notes payable		$ 150,000,000
Commonwealth Edison Co | ShortTermDebtSOFRplus075Oct2023 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Debt instrument, interest rate terms		0.75%
Commonwealth Edison Co | FMB490Feb2033 | First Mortgage
Short-term Debt [Line Items]
Debt instrument, face amount						$ 400,000,000
Commonwealth Edison Co | FMB530Feb2053 | First Mortgage
Short-term Debt [Line Items]
Debt instrument, face amount						$ 575,000,000
Commonwealth Edison Co | ShortTermDebtSOFRplus100May72024
Short-term Debt [Line Items]
Short-term bank loans and notes payable	$ 400,000,000
Commonwealth Edison Co | ShortTermDebtSOFRplus100May72024 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Debt instrument, interest rate terms	1.00%
Revolving Credit Facility | Corporate, Non-Segment
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			$ 0
Line of credit facility, maximum borrowing capacity			900,000,000
Revolving Credit Facility | Commonwealth Edison Co
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			1,000,000,000
Revolving Credit Facility | PECO Energy Co
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			600,000,000
Revolving Credit Facility | Baltimore Gas and Electric Company
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			600,000,000
Revolving Credit Facility | Potomac Electric Power Company
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			300,000,000
Revolving Credit Facility | Delmarva Power and Light Company
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			300,000,000
Revolving Credit Facility | Atlantic City Electric Company
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			$ 300,000,000
Letter of Credit | Commonwealth Edison Co
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity							$ 40,000,000
Letter of Credit | PECO Energy Co
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity							40,000,000
Letter of Credit | Baltimore Gas and Electric Company
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity							15,000,000
Letter of Credit | Potomac Electric Power Company
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity							15,000,000
Letter of Credit | Delmarva Power and Light Company
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity							15,000,000
Letter of Credit | Atlantic City Electric Company
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity							$ 15,000,000