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Defined Benefit Pension Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | e following table summarizes our net periodic pension cost for our defined benefit pension and postretirement plans during the three and six months ended June 30, 2021, and 2020:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | — |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Other components of net periodic pension cost 1: |  |  |  |  |  |  |
Interest cost | 2 |  |  | 3 |  |  | 4 |  |  | 5 |
Expected return on plan assets | (3) |  |  | (4) |  |  | (6) |  |  | (7) |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | — |
Amortization of net loss | 1 |  |  | 1 |  |  | 3 |  |  | 3 |
Net periodic pension cost | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |
1Other components of net periodic pension cost are included in Other non-operating items on our Condensed Consolidated Statements of Income.

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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