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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2016
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
| 2016 |  | 2015 |  | 2016 |  | 2015
Three months ended June 30: |  |  |  |  |  |  |
Service cost | $ | 28 |  |  | $ | 28 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost | 21 |  |  | 25 |  |  | 3 |  |  | 3 |
Expected return on plan assets | (34 | ) |  | (34 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Prior service credit | (5 | ) |  | (6 | ) |  | (4 | ) |  | (4 | )
Net actuarial loss | 12 |  |  | 15 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 22 |  |  | $ | 28 |  |  | $ | — |  |  | $ | 1 |
Six months ended June 30: |  |  |  |  |  |  |
Service cost | $ | 56 |  |  | $ | 55 |  |  | $ | 3 |  |  | $ | 4 |
Interest cost | 42 |  |  | 49 |  |  | 6 |  |  | 7 |
Expected return on plan assets | (69 | ) |  | (67 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Prior service credit | (10 | ) |  | (11 | ) |  | (8 | ) |  | (9 | )
Net actuarial loss | 24 |  |  | 31 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 43 |  |  | $ | 57 |  |  | $ | 1 |  |  | $ | 2 |
Our anticipated contributions to our pension and other postretirement benefit plans during 2016 have not changed from amounts previously disclosed in our financial statements for the year ended December 31, 2015. We contributed $14 million and $21 million, respectively, to our pension plans and $8 million and $6 million, respectively, to our other postretirement benefit plans during the six months ended June 30, 2016 and 2015.

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