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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2020
Defined Benefit Plan [Abstract] |
EMPLOYEE BENEFIT PLANS | 9. 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
| 2020 |  | 2019 |  | 2020 |  | 2019
Three months ended March 31 |  |  |  |  |  |  |
Service cost | $ | 35 |  |  | $ | 30 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 21 |  |  | 24 |  |  | 2 |  |  | 3 |
Expected return on plan assets | (44 | ) |  | (42 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | 18 |  |  | 10 |  |  | — |  |  | (1 | )
Prior service credit | (5 | ) |  | (4 | ) |  | (1 | ) |  | (2 | )
Special charges | — |  |  | — |  |  | — |  |  | 1 |
Net periodic benefit cost | $ | 25 |  |  | $ | 18 |  |  | $ | 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. During the three months ended March 31, 2020 and 2019, we contributed $12 million and $14 million, respectively, to our pension plans and $4 million to our other postretirement benefit plans during each period. We previously disclosed in our annual report on Form 10-K for the year ended December 31, 2019 that we planned to contribute approximately $140 million to our pension plans and $21 million to our other postretirement benefit plans during 2020. Due to the current economic environment, we are reconsidering our intent to make a discretionary contribution of up to $100 million to our qualified U.S. pension plan.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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