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Postretirement Benefit Plans | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Postretirement Benefit Plans | Postretirement Benefit Plans The following table provides the components of net periodic benefit cost for our defined benefit pension plans, disaggregated by domestic and international plans.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in millions) | 2015 |  | 2014 |  | 2015 |  | 2014
Domestic defined benefit pension plans: |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost | 1 |  |  | — |  |  | 3 |  |  | 2 |
Expected return on plan assets | (2 | ) |  | (1 | ) |  | (4 | ) |  | (3 | )
Amortization of net actuarial loss | 1 |  |  | — |  |  | 2 |  |  | 1 |
Net periodic benefit cost | $ | 1 |  |  | $ | — |  |  | $ | 3 |  |  | $ | 2 |
International defined benefit pension plans: |  |  |  |  |  |  |
Service cost | $ | 3 |  |  | $ | 3 |  |  | $ | 9 |  |  | $ | 11 |
Interest cost | 6 |  |  | 8 |  |  | 18 |  |  | 22 |
Expected return on plan assets | (8 | ) |  | (8 | ) |  | (25 | ) |  | (25 | )
Amortization of net actuarial loss | 3 |  |  | 2 |  |  | 10 |  |  | 6 |
Net periodic benefit cost | $ | 4 |  |  | $ | 5 |  |  | $ | 12 |  |  | $ | 14 |
Total net periodic benefit cost | $ | 5 |  |  | $ | 5 |  |  | $ | 15 |  |  | $ | 16 |
The total net periodic benefit cost for other postretirement employee benefit plans was $1 million and $3 million including amounts recognized in other comprehensive income ("OCI") of less than $1 million for both the three and nine months ended September 30, 2015, respectively. The total net periodic benefit cost for other postretirement employee benefit plans was $1 million and $4 million including amounts recognized in OCI of less than $1 million and $1 million for the three and nine months ended September 30, 2014, respectively. We contributed $21 million and $30 million to our defined benefit plans during the nine months ended September 30, 2015 and 2014, respectively. Additional contributions ranging between approximately $6 million and $10 million are expected during the remainder of 2015. During the third quarter 2014, we amended one of our international pension plans as well as one of our domestic other postretirement plans. The pension plan amendment froze the accrual of benefits and closed the plan to new entrants. The other postretirement plan amendment modified the accrual of benefits and closed the plan to new entrants. The overall impact of these changes to our third quarter 2014 financial statements was a $10 million increase to funded status. This included a net loss of $3 million ($1 million net of tax) and a prior service credit of $13 million ($8 million net of tax) recognized in OCI.

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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=35742057&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=35743120&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=6414718&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=6414199&loc=d3e39622-114963 + Details
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