Debt and Credit Agreements (All Registrants) - Narrative (Details) - USD ($)		9 Months Ended
	May 09, 2023	Sep. 30, 2024	Mar. 14, 2024	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 | ShortTermDebtAmend2 Mar142024
Short-term Debt [Line Items]
Short-term bank loans and notes payable			$ 350,000,000
Debt instrument, interest rate terms		1.05%
Corporate, Non-Segment | ShortTermDebtAmend7 Mar142024
Short-term Debt [Line Items]
Short-term bank loans and notes payable			$ 150,000,000
Debt instrument, interest rate terms		1.05%
Commonwealth Edison Co | ShortTermDebtSOFRplus100May72024
Short-term Debt [Line Items]
Short-term bank loans and notes payable	$ 400,000,000
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