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Debt and Credit Agreements (All Registrants) - Narrative (Details) - USD ($) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
May 09, 2023 | Sep. 30, 2024 | Mar. 14, 2024 | Mar. 23, 2017
Corporate, Non-Segment | ShortTermDebt03232017 |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term bank loans and notes payable |  |  |  | $ 500,000,000
Corporate, Non-Segment | ShortTermDebtAmend2 Mar142024 |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term bank loans and notes payable |  |  | $ 350,000,000 |
Debt instrument, interest rate terms |  | 1.05% |  |
Corporate, Non-Segment | ShortTermDebtAmend7 Mar142024 |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term bank loans and notes payable |  |  | $ 150,000,000 |
Debt instrument, interest rate terms |  | 1.05% |  |
Commonwealth Edison Co | ShortTermDebtSOFRplus100May72024 |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term bank loans and notes payable | $ 400,000,000 |  |  |
Debt instrument, interest rate terms | 1.00% |  |  |
Revolving Credit Facility | Corporate, Non-Segment |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum amount outstanding during period |  | $ 0 |  |
Line of credit facility, maximum borrowing capacity |  | 900,000,000 |  |
Revolving Credit Facility | Commonwealth Edison Co |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum amount outstanding during period |  | 0 |  |
Line of credit facility, maximum borrowing capacity |  | 1,000,000,000 |  |
Revolving Credit Facility | PECO Energy Co |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum amount outstanding during period |  | 0 |  |
Line of credit facility, maximum borrowing capacity |  | 600,000,000 |  |
Revolving Credit Facility | Baltimore Gas and Electric Company |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum amount outstanding during period |  | 0 |  |
Line of credit facility, maximum borrowing capacity |  | 600,000,000 |  |
Revolving Credit Facility | Potomac Electric Power Company |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum amount outstanding during period |  | 0 |  |
Line of credit facility, maximum borrowing capacity |  | 300,000,000 |  |
Revolving Credit Facility | Delmarva Power and Light Company |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum amount outstanding during period |  | 0 |  |
Line of credit facility, maximum borrowing capacity |  | 300,000,000 |  |
Revolving Credit Facility | Atlantic City Electric Company |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum amount outstanding during period |  | 0 |  |
Line of credit facility, maximum borrowing capacity |  | 300,000,000 |  |
Letter of Credit | Commonwealth Edison Co |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 40,000,000 |  |
Letter of Credit | PECO Energy Co |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 40,000,000 |  |
Letter of Credit | Baltimore Gas and Electric Company |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 15,000,000 |  |
Letter of Credit | Potomac Electric Power Company |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 15,000,000 |  |
Letter of Credit | Delmarva Power and Light Company |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 15,000,000 |  |
Letter of Credit | Atlantic City Electric Company |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 15,000,000 |  |

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