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Regulatory Matters - Schedule of Completed Rate Cases (Details) $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 48 Months Ended
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Jun. 10, 2024 USD ($) | Apr. 18, 2024 USD ($) | Feb. 23, 2024 USD ($) | Dec. 14, 2023 USD ($) | Nov. 30, 2023 USD ($) | Nov. 17, 2023 USD ($) | Sep. 29, 2023 USD ($) | Aug. 21, 2023 USD ($) | Apr. 21, 2023 USD ($) | Feb. 17, 2023 USD ($) | Jan. 17, 2023 USD ($) | Dec. 14, 2022 USD ($) | May 19, 2022 USD ($) | Feb. 03, 2022 | Sep. 30, 2024 USD ($) | Dec. 31, 2027 USD ($)
Commonwealth Edison Co |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis points for ComEd's Revenue Requirement |  |  |  |  |  |  |  |  |  |  |  |  |  | 580 |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  | $ 1,487 |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | $ 501 |  |  |  |  |  |  |  |  |  |  |  |
Approved Return on Equity, Percentage |  |  |  | 8.905% |  |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Debt Capital Structure, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2023 | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (986)
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | $ 451 |  |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  | $ 838 |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  | $ 810 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Return on Equity, Percentage |  | 8.905% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  | $ 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  | 186 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing | 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  | 221 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing | 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  | 253 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Reconciliation Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation |  |  |  |  |  |  |  |  | $ 247 |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  | $ 259 |  |  |  |  |  |  |  |  |  |  |
Approved Return on Equity, Percentage |  |  |  |  | 8.91% |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Equity Capital Structure, Percentage |  |  |  |  | 6.48% |  |  |  |  |  |  |  |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Reconciliation Rate Case | 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis points for ComEd's Revenue Requirement |  |  |  |  | 580 |  |  |  |  |  |  |  |  |  |  |
Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  | $ 313 |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | $ 179 |  |  |  |  |  |  |  |  |  |  |  |
Approved Return on Equity, Percentage |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |
Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Base Rate Case | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | $ 41 |  |  |  |  |  |  |  |  |  |  |  |
Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Base Rate Case | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | 113 |  |  |  |  |  |  |  |  |  |  |  |
Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Base Rate Case | 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |
Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  | $ 289 |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | $ 229 |  |  |  |  |  |  |  |  |  |  |  |
Approved Return on Equity, Percentage |  |  |  | 9.45% |  |  |  |  |  |  |  |  |  |  |  |
Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Base Rate Case | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | $ 126 |  |  |  |  |  |  |  |  |  |  |  |
Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Base Rate Case | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | 62 |  |  |  |  |  |  |  |  |  |  |  |
Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Base Rate Case | 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  | $ 41 |  |  |  |  |  |  |  |  |  |  |  |
Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Reconciliation Rate Case | 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13 |
Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Reconciliation Rate Case | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39 |
Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Reconciliation Rate Case | 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79 |
Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Reconciliation Rate Case | 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |
Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Reconciliation Rate Case | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |
Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Reconciliation Rate Case | 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 73 |
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  | $ 111 |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) | $ 45 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Return on Equity, Percentage | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) | $ 45 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount | 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount | 51 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Reconciliation Rate Case | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Reconciliation Rate Case | 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Reconciliation Rate Case | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) | $ 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Delmarva Power and Light Company | Maryland 2022 Electric Distribution Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  |  | $ 38 |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  | $ 29 |  |  |  |
Approved Return on Equity, Percentage |  |  |  |  |  |  |  |  |  |  |  | 9.60% |  |  |  |
Delmarva Power and Light Company | Maryland 2022 Electric Distribution Base Rate Case | 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  | $ 17 |  |  |  |
Delmarva Power and Light Company | Maryland 2022 Electric Distribution Base Rate Case | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |
Delmarva Power and Light Company | Maryland 2022 Electric Distribution Base Rate Case | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  |  |  |  |  |  | $ 6 |  |  |  |
Delmarva Power and Light Company | Delaware 2022 Electric Distribution Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  |  |  |  |  | $ 39 |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Return on Equity, Percentage |  | 9.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Delmarva Power and Light Company | Delaware 2022 Electric Distribution Base Rate Case | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease) Annual Reconciliation |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Delmarva Power and Light Company | Delaware 2022 Electric Distribution Base Rate Case | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease) Annual Reconciliation |  | $ 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Atlantic City Electric Company | New Jersey 2023 Electric Distribution Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  |  |  |  |  |  | $ 92 |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  | $ 45 |  |  |  |  |  |  |  |  |  |
Approved Return on Equity, Percentage |  |  |  |  |  | 9.60% |  |  |  |  |  |  |  |  |  |
Atlantic City Electric Company | New Jersey 2023 Electric Distribution Base Rate Case | 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  | $ 36 |  |  |  |  |  |  |  |  |  |
Atlantic City Electric Company | New Jersey 2023 Electric Distribution Base Rate Case | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters Completed Rate Cases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  | $ 9 |  |  |  |  |  |  |  |  |  |

X
- Definition 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. + References No definition available. + Details
Name: | exc_BasispointsforComEdsRevenueRequirement
Namespace Prefix: | exc_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency, prior year annual reconciliation. + References No definition available. + Details
Name: | exc_PublicUtilitiesRequestedRateIncreaseDecreasePriorYearAnnualReconciliation
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition [Line Items] for Regulatory Matters Completed Rate Cases [Table] + References No definition available. + Details
Name: | exc_RegulatoryMattersCompletedRateCasesLineItems
Namespace Prefix: | exc_
Data Type: | xbrli:stringItemType
Balance Type: | na
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