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Benefit Plans | 9 Months Ended
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Sep. 30, 2021
Benefit Plans [Abstract] |
Benefit Plans | 8. Benefit Plans The Company has several non-contributory defined benefit plans and postretirement benefit plans covering eligible employees and retirees. The following table presents the components of net periodic (benefit) cost for the defined benefit plans:
|  | Pension Benefits |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
(In millions) |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1 |  |  |  |  |  |  | $ | 2 |  |  | $ | 2 |
Interest cost |  |  | 17 |  |  | $ | 24 |  |  |  | 53 |  |  |  | 70 |
Expected return on plan assets |  |  | (41 | ) |  |  | (43 | ) |  |  | (127 | ) |  |  | (130 | )
Amortization of unrecognized net loss |  |  | 12 |  |  |  | 12 |  |  |  | 37 |  |  |  | 35 |
Amortization of unrecognized prior service cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Settlement charge |  |  |  |  |  |  | 1 |  |  |  | 2 |  |  |  | 8 |
Regulatory asset decrease |  |  | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |
Net periodic benefit |  | $ | (10 | ) |  | $ | (6 | ) |  | $ | (32 | ) |  | $ | (14 | )
The net periodic benefit for other postretirement benefits was $1 million for the three months ended September 30, 2021 and the nine months ended September 30, 2021 and 2020. There was no net periodic benefit for the three months ended September 30, 2020.

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