Commitments And Contingencies Additional Narrative Information [Line Items]

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Deferred Prosecution Agreement Liability, Current

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Total number of individual manufactured gas plant sites with associated possible environmental loss contingencies related to remediation.

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Number of individual manufactured gas plant sites where monitoring or remediation activities are occurring.

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Current regulatory liabilities generally represent obligations to make refunds to customers for various reasons including overpayment.

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Amount awarded to other party in judgment or settlement of litigation.

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Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended
	Nov. 30, 2020 USD ($)	Mar. 31, 2023 USD ($) MGPSite
Commonwealth Edison Co [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count \| MGPSite		20
Deferred Prosecution Agreement Payments \| $	$ 200
Customer Refund Liability, Current \| $		$ 38
Commonwealth Edison Co [Member] \| Illinois Chamber of Commerce
Commitments And Contingencies Additional Narrative Information [Line Items]
Customer Refund Liability, Current \| $		$ 31
PECO Energy Co [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count \| MGPSite		6
Baltimore Gas and Electric Company [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count \| MGPSite		4
Delmarva Power and Light Company [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Count \| MGPSite		1
Exelon Business Services Co Affiliate [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Deferred Prosecution Agreement Liability, Current \| $		$ 173