XML 274 R75.htm IDEA: XBRL DOCUMENT
v3.24.3

Regulatory Matters - Annual Electric Transmission Fillings (Details) - USD ($) $ in Millions | May 30, 2024 | May 10, 2024 | Apr. 24, 2024
--- | --- | --- | ---
Commonwealth Edison Co | 2024 Transmission Formula Rate Annual Update |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 32
Annual Reconciliation Increase |  |  | (12)
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 20
Public Utilities, Approved Equity Capital Structure, Percentage |  |  | 8.14%
Public Utilities, Approved Return on Equity, Percentage |  |  | 11.50%
Basis points for Transmission Formula Rate |  |  | 50
PECO Energy Co | 2024 Transmission Formula Rate Annual Update |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 2 |  |
Annual Reconciliation Increase | 3 |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount | $ 5 |  |
Public Utilities, Approved Equity Capital Structure, Percentage | 7.45% |  |
Public Utilities, Approved Return on Equity, Percentage | 10.35% |  |
Cap on Equity Component of Rate of Return on Common Equity in Federal Energy Regulatory Committee Complaint | 55.75% |  |
Basis points for Transmission Formula Rate | 50 |  |
Baltimore Gas and Electric Company | 2024 Transmission Formula Rate Annual Update |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 42
Annual Reconciliation Increase |  |  | 13
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 53
Public Utilities, Approved Equity Capital Structure, Percentage |  |  | 7.47%
Public Utilities, Approved Return on Equity, Percentage |  |  | 10.50%
Basis points for Transmission Formula Rate |  |  | 50
Baltimore Gas and Electric Company | 2024 Transmission Formula Rate Revenue Reduction |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 2
Potomac Electric Power Company | 2024 Transmission Formula Rate Annual Update |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 58 |
Annual Reconciliation Increase |  | 15 |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ 73 |
Public Utilities, Approved Equity Capital Structure, Percentage |  | 7.62% |
Public Utilities, Approved Return on Equity, Percentage |  | 10.50% |
Basis points for Transmission Formula Rate |  | 50 |
Delmarva Power and Light Company | 2024 Transmission Formula Rate Annual Update |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 7 |
Annual Reconciliation Increase |  | 17 |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ 24 |
Public Utilities, Approved Equity Capital Structure, Percentage |  | 7.23% |
Public Utilities, Approved Return on Equity, Percentage |  | 10.50% |
Basis points for Transmission Formula Rate |  | 50 |
Atlantic City Electric Company | 2024 Transmission Formula Rate Annual Update |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 14 |
Annual Reconciliation Increase |  | 18 |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ 32 |
Public Utilities, Approved Equity Capital Structure, Percentage |  | 7.11% |
Public Utilities, Approved Return on Equity, Percentage |  | 10.50% |
Basis points for Transmission Formula Rate |  | 50 |

X
- Definition Basis points for Transmission Formula Rate + References No definition available. + Details
Name: | exc_BasisPointsForTransmissionFormulaRate
Namespace Prefix: | exc_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum percentage allowed for the equity component of the rate of return on common equity in the Federal Energy Regulatory Committee Complaint. + References No definition available. + Details
Name: | exc_CaponEquityComponentofRateofReturnonCommonEquityinFederalEnergyRegulatoryCommitteeComplaint
Namespace Prefix: | exc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected adjustment to revenue to be recorded in the prior year. + References No definition available. + Details
Name: | exc_Revenue
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of public utility's approved equity to capital, including debt and equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedEquityCapitalStructurePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types: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_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of public utility's amended requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmendedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=exc_A2024TransmissionFormulaRateAnnualUpdateMember
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_BaltimoreGasAndElectricCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=exc_A2024TransmissionFormulaRateRevenueReductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=exc_PotomacElectricPowerCompanyMember
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: |

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