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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2021
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
| 2021 |  | 2020 |  | 2021 |  | 2020
Three months ended March 31 |  |  |  |  |  |  |
Service cost | $ | 40 |  |  | $ | 35 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost | 18 |  |  | 21 |  |  | 2 |  |  | 2 |
Expected return on plan assets | (48) |  |  | (44) |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial loss | 20 |  |  | 18 |  |  | — |  |  | — |
Prior service credit | (4) |  |  | (5) |  |  | (2) |  |  | (1) |
Net periodic benefit cost | $ | 26 |  |  | $ | 25 |  |  | $ | 2 |  |  | $ | 2 |
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” in the statements of income. As previously disclosed in our annual report on Form 10-K for the year ended December 31, 2020, we plan to contribute approximately $128 million to our pension plans and $22 million to our other postretirement benefit plans during 2021. During the three months ended March 31, 2021 and 2020, we contributed $21 million and $12 million, respectively, to our pension plans and $3 million and $4 million, respectively, to our other postretirement benefit plans.

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