No definition available.

Name:	exc_BasisPointsComEdSymmetricalPerformanceAdjustments
Namespace Prefix:	exc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum increase of revenue requirement

+ References

No definition available.

+ Details

Name:	exc_MaximumIncreaseOfRevenueRequirement
Namespace Prefix:	exc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Regulatory Matters Additional Narrative Information [Line Items]

+ References

No definition available.

+ Details

Name:	exc_RegulatoryMattersAdditionalNarrativeInformationLineItems
Namespace Prefix:	exc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

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

+ Details

Name:	us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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.

+ References

+ Details

Name:	us-gaap_IncreaseDecreaseInRegulatoryLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of public utility's approved debt to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedDebtCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

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/1943274/2147478742/980-340-50-1

+ Details

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=exc_CommonwealthEdisonCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=exc_Illinois2023ElectricDistributionBaseRateCaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	exc_PeriodAxis=exc_A2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryLiabilityAxis=exc_ComEdFERCAuditSettlementLossContingencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAssetAxis=exc_CarbonMitigationCreditRiderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=exc_PecoEnergyCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryLiabilityAxis=exc_NuclearDecommissioningMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryLiabilityAxis=exc_OverRecoveredEnergyAndNaturalGasCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAssetAxis=us-gaap_DeferredIncomeTaxChargesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=exc_AtlanticCityElectricCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryLiabilityAxis=exc_UnderOverRecoveredTransmissionCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Regulatory Matters - Narrative (Details) $ in Millions				3 Months Ended	48 Months Ended
Regulatory Matters - Narrative (Details) $ in Millions	Dec. 19, 2024 USD ($)	Dec. 14, 2023 USD ($)	Sep. 27, 2022 basisPoint	Mar. 31, 2025 USD ($)	Dec. 31, 2027 USD ($)	Dec. 31, 2024 USD ($)
Commonwealth Edison Co
Regulatory Matters Additional Narrative Information [Line Items]
Maximum increase of revenue requirement				105.00%
Basis Points - ComEd Symmetrical Performance Adjustments \| basisPoint			0.0032
Commonwealth Edison Co \| Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Approved Revenue Requirement Increase (Decrease)	$ 1,045	$ 501
Commonwealth Edison Co \| Forecast [Member] \| Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Public Utilities, Approved Debt Capital Structure, Percentage					50.00%
Commonwealth Edison Co \| Forecast [Member] \| 2023 \| Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Approved Revenue Requirement Increase (Decrease)					$ (986)
Commonwealth Edison Co \| ComEd FERC Audit Settlement Regulatory Liability
Regulatory Matters Additional Narrative Information [Line Items]
Loss Contingency Accrual						$ 70
Commonwealth Edison Co \| Carbon Mitigation Credit rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets				$ 17
PECO Energy Co
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				61
Increase (Decrease) in Regulatory Liabilities				93
PECO Energy Co \| Nuclear Decommissioning [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				64
PECO Energy Co \| Over Recovered Energy and Natural Gas Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				32
PECO Energy Co \| Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				71
Atlantic City Electric Company
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				10
Atlantic City Electric Company \| Under/Over Recovered Transmission Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				$ 8