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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2018
Defined Benefit Plan [Abstract] |
EMPLOYEE BENEFIT PLANS |
7. | EMPLOYEE BENEFIT PLANS
The components of net periodic benefit cost (credit) related to our defined benefit plans were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| 2018 |  | 2017 |  | 2018 |  | 2017
Three months ended March 31: |  |  |  |  |  |  |
Service cost | $ | 34 |  |  | $ | 31 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 23 |  |  | 21 |  |  | 2 |  |  | 3 |
Expected return on plan assets | (41 | ) |  | (37 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | 16 |  |  | 13 |  |  | — |  |  | (1 | )
Prior service credit | (5 | ) |  | (5 | ) |  | (3 | ) |  | (4 | )
Special charges | 2 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (credit) | $ | 29 |  |  | $ | 23 |  |  | $ | — |  |  | $ | (1 | )
The components of net periodic benefit cost (credit) other than the service cost component (i.e., the non-service cost components) are included in the line item “other income, net” in the statements of income. Our anticipated contributions to our pension and other postretirement benefit plans during 2018 have not changed from amounts previously disclosed in our financial statements for the year ended December 31, 2017. We contributed $8 million and $7 million, respectively, to our pension plans and $4 million and $5 million, respectively, to our other postretirement benefit plans during the three months ended March 31, 2018 and 2017.

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- References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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