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Revenue from Contracts with Customers - Narrative (Details) | Sep. 30, 2024 | Dec. 31, 2023 | Jul. 01, 2020
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 3 months |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Pepco Holdings LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 3 months |  |
Pepco Holdings LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Pepco Holdings LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Pepco Holdings LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Pepco Holdings LLC | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  |  | 35 years
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  | 31 years |
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 3 months |  |
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  |  | 35 years
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  | 31 years |
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 3 months |  |
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  |  | 35 years
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  | 31 years |
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 3 months |  |
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |

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