Commitments And Contingencies Additional Narrative Information [Line Items]

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Environmental Liability - Anacostia

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Environmental Liability - Buzzard Point

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Insurers' Settlement Payment

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Number Of Former Manufactured Gas Plant Sites

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Settling Shareholders' Attorney Fees

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Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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Amount awarded to other party in judgment or settlement of litigation.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Cash outflows made during the period for environmental remediation activities.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
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-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

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Commitments and Contingencies - Narrative (Details) $ in Millions			1 Months Ended	6 Months Ended
	Apr. 07, 2026 USD ($)	Apr. 09, 2025 USD ($)	Nov. 30, 2020 USD ($)	Jun. 30, 2026 USD ($) mGPSite	Apr. 11, 2024 USD ($)	Feb. 02, 2024 USD ($)
Commitments And Contingencies Additional Narrative Information [Line Items]
Income Taxes Receivable, Noncurrent				$ 160
Commonwealth Edison Co
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count \| mGPSite				16
Deferred Prosecution Agreement Payments			$ 200
PECO Energy Co
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count \| mGPSite				5
Baltimore Gas and Electric Company
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count \| mGPSite				4
Income Taxes Receivable, Noncurrent				$ 110
Delmarva Power and Light Company
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count \| mGPSite				1
Income Taxes Receivable, Noncurrent				$ 20
Potomac Electric Power Company
Commitments And Contingencies Additional Narrative Information [Line Items]
Environmental Liability - Anacostia					$ 47
Environmental Liability - Buzzard Point						$ 10
Income Taxes Receivable, Noncurrent				30
Payments for Environmental Liabilities	$ 12	$ 12
Exelon Business Services Co Affiliate
Commitments And Contingencies Additional Narrative Information [Line Items]
Insurers' Settlement Payment				40
Settling Shareholders' Attorney Fees				10
Pepco Holdings LLC
Commitments And Contingencies Additional Narrative Information [Line Items]
Income Taxes Receivable, Noncurrent				$ 50