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Pension Benefits (Tables) | 9 Months Ended
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Sep. 30, 2017
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | The components of net periodic benefit cost associated with our significant U.S. pension plans are as follows:
| Quarter ended |  | Year to date
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 2 |  |  | $ | 4 |  |  | $ | 8 |  |  | $ | 12 |
Interest cost | 9 |  |  | 12 |  |  | 29 |  |  | 37 |
Expected return on plan assets | (10 | ) |  | (15 | ) |  | (33 | ) |  | (45 | )
Amortization of net loss | 1 |  |  | 1 |  |  | 4 |  |  | 4 |
Amortization of prior service cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Net periodic benefit cost | $ | 4 |  |  | $ | 4 |  |  | $ | 12 |  |  | $ | 12 |
Additional loss recognized due to settlements(a) | $ | 8 |  |  | $ | 1 |  |  | $ | 16 |  |  | $ | 1 |
Pension data adjustment(b) | $ | — |  |  | $ | — |  |  | $ | 22 |  |  | $ | — |
Special termination benefits | $ | 2 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |
(a) | Losses are a result of settlement transactions in each of our U.S. plans which exceeded the sum of annual service and interest costs for each plan. These losses were recorded in Other pension (income) expense.
(b) | Reflects a non-cash, out-of-year charge related to the adjustment of certain historical deferred vested liability balances in the Plan during the first quarter of 2017 recorded in Other pension (income) expense. See Note 5.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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