Name:	exc_BasisPointsComEdSymmetricalPerformanceAdjustments
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Maximum basis points that can be added to the average rate on 30-year treasury notes, to determine the allowed ROE for ComEd's revenue requirement.

No definition available.

Name:	exc_BasispointsforComEdsRevenueRequirement
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Beneficial electrification approved annual spending

No definition available.

Name:	exc_BeneficialElectrificationApprovedAnnualSpending
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Balance Type:	credit
Period Type:	duration

Contract Termination Liability

No definition available.

Name:	exc_ContractTerminationLiability
Namespace Prefix:	exc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Current requested revenue increase 2024-2027

No definition available.

Name:	exc_CurrentRequestedRevenueIncrease20242027
Namespace Prefix:	exc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Initial requested revenue increase 2024-2027

No definition available.

Name:	exc_InitialRequestedRevenueIncrease20242027
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Maximum increase of revenue requirement

No definition available.

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Regulatory Matters Additional Narrative Information [Line Items]

No definition available.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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Data Type:	xbrli:monetaryItemType
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The increase (decrease) during the reporting period in regulated liabilities. Regulated liabilities are created when regulatory agency permits an entity to defer revenues to the balance sheet.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Amount of public utility's approved rate increase (decrease) by regulatory agency.

No definition available.

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Data Type:	xbrli:monetaryItemType
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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481878/980-340-50-1

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Period Type:	instant

Name:	dei_LegalEntityAxis=exc_CommonwealthEdisonCoMember
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Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
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Name:	dei_LegalEntityAxis=exc_PotomacElectricPowerCompanyMember
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Data Type:	na
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Name:	dei_LegalEntityAxis=exc_DelmarvaPowerandLightCompanyMember
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Data Type:	na
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Data Type:	na
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