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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2024
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
| 2024 |  | 2023 |  | 2024 |  | 2023
Three months ended June 30 |  |  |  |  |  |  |
Service cost | $ | 28 |  |  | $ | 28 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 32 |  |  | 30 |  |  | 3 |  |  | 3 |
Expected return on plan assets | (54) |  |  | (51) |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial gain | (2) |  |  | (1) |  |  | (1) |  |  | (2) |
Prior service credit | (2) |  |  | (4) |  |  | — |  |  | (1) |
Net periodic benefit cost | $ | 2 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 1 |
Six months ended June 30 |  |  |  |  |  |  |
Service cost | $ | 56 |  |  | $ | 56 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost | 63 |  |  | 60 |  |  | 6 |  |  | 6 |
Expected return on plan assets | (107) |  |  | (101) |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial gain | (3) |  |  | (3) |  |  | (2) |  |  | (3) |
Prior service credit | (5) |  |  | (9) |  |  | — |  |  | (2) |
Net periodic benefit cost | $ | 4 |  |  | $ | 3 |  |  | $ | 6 |  |  | $ | 3 |
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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