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Regulatory Matters - Narrative (Details) $ in Millions |  |  |  | 9 Months Ended | 36 Months Ended | 48 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 14, 2023 USD ($) | Sep. 27, 2022 | Feb. 03, 2022 | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2027 USD ($) | Mar. 31, 2022 USD ($)
Commonwealth Edison Co |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Basis points for ComEd's Revenue Requirement |  |  | 580 |  |  |  |  |
Maximum increase of revenue requirement |  |  |  | 105.00% |  |  |  |
Basis Points - ComEd Symmetrical Performance Adjustments |  | 32 |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets |  |  |  | $ 414 |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | 1,155 |  |  |  |
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) | $ 501 |  |  |  |  |  |  |
Commonwealth Edison Co | Forecast [Member] |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Beneficial electrification approved annual spending |  |  |  |  |  | $ 77 |  |
Commonwealth Edison Co | Forecast [Member] | 2023 | Illinois 2023 Electric Distribution Base Rate Case |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Approved Revenue Requirement Increase (Decrease) |  |  |  |  |  |  | $ (986) |
Commonwealth Edison Co | Nuclear Decommissioning [Member] |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | 1,029 |  |  |  |
Commonwealth Edison Co | ComEd FERC Audit Settlement Regulatory Liability |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Regulatory Liabilities |  |  |  | 70 |  |  |  |
Commonwealth Edison Co | Carbon Mitigation Credit rider |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  | 183 |  |  |  |
Increase (Decrease) in Regulatory Assets |  |  |  | 490 |  |  |  |
PECO Energy Co |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets |  |  |  | 69 |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | 53 |  |  |  |
PECO Energy Co | Nuclear Decommissioning [Member] |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | 60 |  |  |  |
PECO Energy Co | Deferred Income Tax Charge [Member] |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets |  |  |  | 96 |  |  |  |
Baltimore Gas and Electric Company |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | (102) |  |  |  |
Baltimore Gas and Electric Company | Deferred Income Tax Charge [Member] |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | (101) |  |  |  |
Potomac Electric Power Company |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets |  |  |  | 29 |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | (46) |  |  |  |
Potomac Electric Power Company | Deferred Income Tax Charge [Member] |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | (46) |  |  |  |
Potomac Electric Power Company | Multi-year plan reconciliation |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets |  |  |  | 27 |  |  |  |
Potomac Electric Power Company | Revenue deferral mechanism |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets |  |  |  | 9 |  |  |  |
Atlantic City Electric Company |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Contract Termination Liability |  |  |  | 10 |  |  |  | $ 203
Gain (Loss) on Contract Termination |  |  |  | 40 | $ 65 |  |  |
Increase (Decrease) in Regulatory Assets |  |  |  | (10) |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | 10 |  |  |  |
Atlantic City Electric Company | Under/Over Recovered Transmission Costs |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | 12 |  |  |  |
Atlantic City Electric Company | Under Recovered Energy and Natural Gas Costs |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets |  |  |  | (37) |  |  |  |
Delmarva Power and Light Company |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | (37) |  |  |  |
Delmarva Power and Light Company | Deferred Income Tax Charge [Member] |  |  |  |  |  |  |  |
Regulatory Matters Additional Narrative Information [Line Items] |  |  |  |  |  |  |  |
Increase (Decrease) in Regulatory Liabilities |  |  |  | $ (20) |  |  |  |

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