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Retirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Calculation of Net Periodic Benefit Costs | A portion of the net periodic benefit cost for all plans is capitalized within the Consolidated Balance Sheets. The following tables present the components of Exelon's net periodic benefit costs, prior to capitalization, for the three and nine months ended September 30, 2024 and 2023.
| Pension Benefits |  | OPEB
| Three Months Ended September 30, |  | Three Months Ended September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit cost |  |  |  |  |  |  |
Service cost | $ | 43 |  |  | $ | 39 |  |  | $ | 6 |  |  | $ | 6 |
Interest cost | 141 |  |  | 145 |  |  | 24 |  |  | 25 |
Expected return on assets | (184) |  |  | (189) |  |  | (21) |  |  | (21) |
Amortization of: |  |  |  |  |  |  |
Prior service cost (credit) | 1 |  |  | 1 |  |  | (2) |  |  | (2) |
Actuarial loss | 53 |  |  | 41 |  |  | — |  |  | — |
Settlement charges | — |  |  | 18 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 54 |  |  | $ | 55 |  |  | $ | 7 |  |  | $ | 8 |
| Pension Benefits |  | OPEB
| Nine Months Ended September 30, |  | Nine Months Ended September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit cost |  |  |  |  |  |  |
Service cost | $ | 125 |  |  | $ | 116 |  |  | $ | 20 |  |  | $ | 18 |
Interest cost | 423 |  |  | 434 |  |  | 72 |  |  | 76 |
Expected return on assets | (552) |  |  | (566) |  |  | (63) |  |  | (63) |
Amortization of: |  |  |  |  |  |  |
Prior service cost (credit) | 2 |  |  | 2 |  |  | (6) |  |  | (7) |
Actuarial loss (gain) | 160 |  |  | 125 |  |  | — |  |  | (1) |
Settlement charges | — |  |  | 18 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 158 |  |  | $ | 129 |  |  | $ | 23 |  |  | $ | 23 |
Allocated Portion of Pension and Postretirement Benefit Costs | The amounts below represent the Registrants' allocated pension and OPEB costs. For Exelon, the service cost component is included in Operating and maintenance expense and Property, plant, and equipment, net while the non-service cost components are included in Other, net and Regulatory assets. For the Utility Registrants, which apply multi-employer accounting, the service cost and non-service cost components are included in Operating and maintenance expense and Property, plant, and equipment, net in their consolidated financial statements.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Pension and OPEB Costs (Benefit) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Exelon |  | $ | 61 |  |  | $ | 63 |  |  | $ | 181 |  |  | $ | 152 |
ComEd |  | 17 |  |  | 6 |  |  | 53 |  |  | 19 |
PECO |  | (1) |  |  | (3) |  |  | (1) |  |  | (10) |
BGE |  | 14 |  |  | 14 |  |  | 45 |  |  | 42 |
PHI |  | 25 |  |  | 25 |  |  | 71 |  |  | 74 |
Pepco |  | 8 |  |  | 9 |  |  | 24 |  |  | 26 |
DPL |  | 4 |  |  | 4 |  |  | 11 |  |  | 13 |
ACE |  | 3 |  |  | 3 |  |  | 10 |  |  | 10 |
Defined Contribution Savings Plans | The Registrants participate in a 401(k) defined contribution savings plan that is sponsored by Exelon. The plan is qualified under applicable sections of the IRC and allows employees to contribute a portion of their pre-tax and/or after-tax income in accordance with specified guidelines. All Registrants match a percentage of the employee contributions up to certain limits. The following table presents the employer contributions and employer matching contributions to the savings plan for the three and nine months ended September 30, 2024 and 2023.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Savings Plan Employer Contributions |  | 2024 |  | 2023 |  | 2024 |  | 2023
Exelon |  | $ | 25 |  |  | $ | 27 |  |  | $ | 76 |  |  | $ | 74 |
ComEd |  | 12 |  |  | 12 |  |  | 32 |  |  | 31 |
PECO |  | 3 |  |  | 3 |  |  | 11 |  |  | 10 |
BGE |  | 2 |  |  | 3 |  |  | 8 |  |  | 8 |
PHI |  | 4 |  |  | 5 |  |  | 12 |  |  | 13 |
Pepco |  | 1 |  |  | 1 |  |  | 3 |  |  | 3 |
DPL |  | 1 |  |  | 1 |  |  | 3 |  |  | 3 |
ACE |  | 1 |  |  | 1 |  |  | 2 |  |  | 2 |

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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