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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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
| 2017 |  | 2016 |  | 2017 |  | 2016
Three months ended March 31: |  |  |  |  |  |  |
Service cost | $ | 31 |  |  | $ | 28 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost | 21 |  |  | 21 |  |  | 3 |  |  | 3 |
Expected return on plan assets | (37 | ) |  | (35 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | 13 |  |  | 12 |  |  | (1 | ) |  | — |
Prior service credit | (5 | ) |  | (5 | ) |  | (4 | ) |  | (4 | )
Net periodic benefit cost | $ | 23 |  |  | $ | 21 |  |  | $ | (1 | ) |  | $ | 1 |
Our anticipated contributions to our pension and other post retirement benefit plans during 2017 have not changed from amounts previously disclosed in our financial statements for the year ended December 31, 2016. We contributed $7 million and $8 million, respectively, to our pension plans and $5 million and $4 million, respectively, to our other postretirement benefit plans during the three months ended March 31, 2017 and 2016.

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