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Regulatory Matters - Schedule of Pending Rate Cases (Details) - USD ($) $ in Millions | Sep. 20, 2024 | Sep. 11, 2024 | Aug. 30, 2024 | Aug. 13, 2024 | Mar. 28, 2024 | Feb. 27, 2024
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Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease), Amended |  |  |  | $ 667 |  |
Requested Return on Equity, Percentage |  |  |  | 8.905% |  |
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2024 |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease), Amended |  |  |  | $ 309 |  |
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2025 |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease), Amended |  |  |  | 95 |  |
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2026 |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease), Amended |  |  |  | 128 |  |
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2027 |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease), Amended |  |  |  | $ 135 |  |
Commonwealth Edison Co | Illinois 2024 Electric Distribution Reconciliation Rate Case |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation |  | $ 624 |  |  |  |
Requested Return on Equity, Percentage |  | 9.89% |  |  |  |
PECO Energy Co | Pennsylvania 2024 Electric Distribution Base Rate Case |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  | $ 354 |  | $ 464 |
Requested Return on Equity, Percentage |  |  |  |  | 10.95% |
PECO Energy Co | Pennsylvania 2024 Electric Distribution Base Rate Case | 2025 |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  |  |  | $ (64) |
PECO Energy Co | Pennsylvania 2023 Natural Gas Distribution Base Rate Case |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  |  |  | $ 111 |
Requested Return on Equity, Percentage |  |  |  |  | 11.15% |
PECO Energy Co | Pennsylvania 2024 Gas Distribution Base Rate Case |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  | $ 78 |  |  |
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease), Amended |  |  |  |  |  | $ 186
Requested Return on Equity, Percentage |  |  |  |  |  | 10.50%
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case | 2024 |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  |  |  |  | $ 116
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case | 2025 |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  |  |  |  | 35
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case | 2026 |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) |  |  |  |  |  | $ 35
Delmarva Power and Light Company | DPL 2024 Natural Gas Distribution Base Rate Case |  |  |  |  |  |
Regulatory Matters Pending Rate Cases [Line Items] |  |  |  |  |  |
Requested Revenue Requirement Increase (Decrease) | $ 36 |  |  |  |  |
Requested Return on Equity, Percentage | 10.65% |  |  |  |  |

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