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Employee Benefit Plans | 9 Months Ended
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Sep. 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 September 30: |  |  |  |  |  |  |
Service cost | $ | 28 |  |  | $ | 27 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost | 21 |  |  | 24 |  |  | 3 |  |  | 4 |
Expected return on plan assets | (35 | ) |  | (33 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Prior service credit | (5 | ) |  | (5 | ) |  | (4 | ) |  | (5 | )
Net actuarial (gain) loss | 13 |  |  | 16 |  |  | (1 | ) |  | — |
Special credits | (7 | ) |  | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 15 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 1 |
Nine months ended September 30: |  |  |  |  |  |  |
Service cost | $ | 84 |  |  | $ | 82 |  |  | $ | 5 |  |  | $ | 6 |
Interest cost | 63 |  |  | 73 |  |  | 9 |  |  | 11 |
Expected return on plan assets | (104 | ) |  | (100 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Prior service credit | (15 | ) |  | (16 | ) |  | (12 | ) |  | (14 | )
Net actuarial (gain) loss | 37 |  |  | 47 |  |  | (1 | ) |  | — |
Special charges (credits) | (7 | ) |  | 5 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 58 |  |  | $ | 91 |  |  | $ | 1 |  |  | $ | 3 |
We contributed $132 million and $114 million, respectively, to our pension plans and $12 million and $11 million, respectively, to our other postretirement benefit plans during the nine months ended September 30, 2016 and 2015. Of the $132 million contributed to our pension plans during the nine months ended September 30, 2016, $100 million was discretionary and was contributed during the third quarter of 2016. As a result of the discretionary pension contributions discussed above, our expected contributions to our pension plans have increased to $136 million for 2016. Our anticipated contributions to our other postretirement benefit plans during 2016 have not changed from the amount previously disclosed in our financial statements for the year ended December 31, 2015.

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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 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963 + Details
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