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Derivative Financial Instruments - Schedule of Derivative Instruments (Details) - MWh MWh in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 30, 2012 | Sep. 30, 2024
Commonwealth Edison Co |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Long-term Purchase Commitment, Minimum Energy Volume Required | 1.3 |
PECO Energy Co |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Estimated Percent of Gas Purchases Being Hedged |  | 10.00%
Delmarva Power and Light Company |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Estimated Percent of Gas Purchases Being Hedged |  | 50.00%

X
- Definition The expected/target percentage of future gas purchases being hedged at a gas distribution company. The percentage is calculated as the amount of hedging products divided by the planned natural gas purchases in support of projected firm sales. + References No definition available. + Details
Name: | exc_EstimatedPercentOfGasPurchasesBeingHedged
Namespace Prefix: | exc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Energy volume that must be purchased within the specified time period of the agreement to avoid penalties or unfavorable effects on pricing, among other adverse consequences. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentMinimumEnergyVolumeRequired
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:energyItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=exc_CommonwealthEdisonCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=exc_PecoEnergyCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=exc_DelmarvaPowerandLightCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |