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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2023
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | 7. EMPLOYEE BENEFIT PLANS The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| 2023 |  | 2022 |  | 2023 |  | 2022
Three months ended September 30 |  |  |  |  |  |  |
Service cost | $ | 28 |  |  | $ | 37 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 30 |  |  | 22 |  |  | 3 |  |  | 2 |
Expected return on plan assets | (50) |  |  | (48) |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | (2) |  |  | 14 |  |  | (1) |  |  | — |
Prior service credit | (5) |  |  | (5) |  |  | (1) |  |  | (1) |
Settlement loss | — |  |  | 12 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 1 |  |  | $ | 32 |  |  | $ | 2 |  |  | $ | 2 |
Nine months ended September 30 |  |  |  |  |  |  |
Service cost | $ | 84 |  |  | $ | 114 |  |  | $ | 3 |  |  | $ | 4 |
Interest cost | 90 |  |  | 64 |  |  | 9 |  |  | 6 |
Expected return on plan assets | (151) |  |  | (144) |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | (5) |  |  | 40 |  |  | (4) |  |  | — |
Prior service credit | (14) |  |  | (14) |  |  | (3) |  |  | (3) |
Settlement loss | — |  |  | 12 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 4 |  |  | $ | 72 |  |  | $ | 5 |  |  | $ | 7 |
The components of net periodic benefit cost other than the service cost component (i.e., the non-service cost components) are included in “other income, net.”

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