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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2019
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
| 2019 |  | 2018 |  | 2019 |  | 2018
Three months ended June 30: |  |  |  |  |  |  |
Service cost | $ | 30 |  |  | $ | 33 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost | 25 |  |  | 23 |  |  | 3 |  |  | 3 |
Expected return on plan assets | (41 | ) |  | (41 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | 10 |  |  | 17 |  |  | (1 | ) |  | (1 | )
Prior service credit | (5 | ) |  | (4 | ) |  | (2 | ) |  | (3 | )
Special charges | 2 |  |  | 3 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 21 |  |  | $ | 31 |  |  | $ | 1 |  |  | $ | 1 |
Six months ended June 30: |  |  |  |  |  |  |
Service cost | $ | 60 |  |  | $ | 67 |  |  | $ | 2 |  |  | $ | 3 |
Interest cost | 49 |  |  | 46 |  |  | 6 |  |  | 5 |
Expected return on plan assets | (83 | ) |  | (82 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | 20 |  |  | 33 |  |  | (2 | ) |  | (1 | )
Prior service credit | (9 | ) |  | (9 | ) |  | (4 | ) |  | (6 | )
Special charges | 2 |  |  | 5 |  |  | 1 |  |  | — |
Net periodic benefit cost | $ | 39 |  |  | $ | 60 |  |  | $ | 3 |  |  | $ | 1 |
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 (expense), net” in the statements of income. As previously disclosed in our annual report on Form 10-K for the year ended December 31, 2018, we plan to contribute approximately $35 million to our pension plans and $21 million to our other postretirement benefit plans during 2019. During the six months ended June 30, 2019 and 2018, we contributed $23 million and $16 million, respectively, to our pension plans and $8 million and $9 million, respectively, to our other postretirement benefit plans.

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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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