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Pension Benefits (Tables) | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |  |
Components of Net Periodic Benefit Cost | The components of net periodic benefit cost associated with our U.S. pension plans are as follows:
| Quarter ended |  | Year to date
| 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 2 |  |  | $ | 1 |  |  | $ | 6 |  |  | $ | 4 |
Interest cost | 9 |  |  | 10 |  |  | 26 |  |  | 30 |
Expected return on plan assets | (10) |  |  | (11) |  |  | (32) |  |  | (33) |
Amortization of net loss | 4 |  |  | — |  |  | 11 |  |  | 1 |
Amortization of prior service cost | — |  |  | 2 |  |  | 3 |  |  | 4 |
Net periodic benefit cost | $ | 5 |  |  | $ | 2 |  |  | $ | 14 |  |  | $ | 6 |
Additional loss recognized due to settlements(a) | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 3 |
(a) Loss is a result of settlement transactions which exceeded the sum of annual service and interest costs for the applicable plan. These losses were recorded in Other pension (income) expense. | [1]
[1] | Loss is a result of settlement transactions which exceeded the sum of annual service and interest costs for the applicable plan. These losses were recorded in Other pension (income) expense.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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