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Net Periodic Pension and Postretirement Benefit Costs (Tables) | 6 Months Ended
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Jun. 30, 2021
Pension Plan |
Pension and postretirement benefit plans |
Components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30, | ​
​ | ​ | U.S. Plans | ​ | Non-U.S. Plans | ​ | U.S. Plans | ​ | Non-U.S. Plans | ​
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Service cost | ​ | $ | 1 | ​ | $ | 1 | ​ | $ | 1 | ​ | $ | 1 | ​ | $ | 2 | ​ | $ | 2 | ​ | $ | 2 | ​ | $ | 2 | ​
Interest cost | ​ | ​ | 2 | ​ | ​ | 3 | ​ | ​ | 2 | ​ | ​ | 3 | ​ | ​ | 4 | ​ | ​ | 6 | ​ | ​ | 5 | ​ | ​ | 6 | ​
Expected return on plan assets | ​ | ​ | (4) | ​ | ​ | (6) | ​ | ​ | (2) | ​ | ​ | (2) | ​ | ​ | (9) | ​ | ​ | (11) | ​ | ​ | (4) | ​ | ​ | (4) | ​
Amortization of actuarial loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | 1 | ​
Net periodic benefit cost (a) | ​ | $ | (1) | ​ | $ | (2) | ​ | $ | 1 | ​ | $ | 3 | ​ | $ | (3) | ​ | $ | (3) | ​ | $ | 4 | ​ | $ | 5 | ​
Postemployment Retirement Benefits |
Pension and postretirement benefit plans |
Components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30, | ​
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Service cost | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​
Interest cost | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | 1 | ​ | ​ | 2 | ​
Amortization of prior service credit | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | (1) | ​
Net periodic benefit cost (a) | ​ | $ | — | ​ | $ | 1 | ​ | $ | — | ​ | $ | 1 | ​
| (a) | The service cost component of net periodic benefit cost is presented within either Cost of sales or Operating expenses on the Condensed Consolidated Statements of Income (Loss). The interest cost, expected return on plan assets, amortization of prior service credit, and amortization of actuarial loss components of net periodic benefit cost are presented as Other, non-operating income on the Condensed Consolidated Statements of Income (Loss).

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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