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Pension and Other Post-Retirement Benefit Plans | 12 Months Ended
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Dec. 31, 2020
Pension, Other Post-Retirement Benefits and Employee Benefit Plans. [Abstract] |
Pension and Other Post-Retirement Benefit Plans | 19. Pension and Other Post-Retirement Benefit Plans Pension and other post-retirement benefit plan costs and obligations are primarily within our Food Packaging segment. Pension plans and other post-retirement benefit plans for other segments are not material and are not included in our disclosures below. Viskase sponsors several defined benefit pension plans, including defined contribution plans, varying by country and subsidiary. Additionally, Viskase sponsors health care and life insurance benefits for certain employees and retirees around the world. The pension benefits are funded based on the funding requirements of federal and international laws and regulations, as applicable, in advance of benefit payments and the other benefits are funded as benefits are provided to participating employees. Components of net periodic benefit cost (credit) are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | U.S. and Non-U.S. Pension Benefits
​ | ​ | Year Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
​ | ​ | (in millions)
Service cost | ​ | $ | — | ​ | $ | — | ​ | $ | 1
Interest cost | ​ |  | 5 | ​ |  | 6 | ​ |  | 6
Expected return on plan assets | ​ |  | (5) | ​ |  | (4) | ​ |  | (5)
Amortization of actuarial losses | ​ |  | 1 | ​ |  | 1 | ​ |  | 1
Settlement loss recognized | ​ |  | — | ​ |  | — | ​ |  | 7
​ | ​ | $ | 1 | ​ | $ | 3 | ​ | $ | 10
​ The following table provides disclosures for Viskase’s benefit obligations, plan assets, funded status, and recognition in the consolidated balance sheets. As pension costs for Viskase are not material to our consolidated financial position and results of operations, we do not provide information regarding their inputs and valuation assumptions. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | U.S and Non-U.S. Pension Benefits
​ |  | 2020 |  | 2019
​ | ​ | (in millions)
Change in benefit obligation: | ​ | ​ |  |  | ​ |
Benefit obligation, beginning of year | ​ | $ | 154 | ​ | $ | 146
Interest cost | ​ |  | 5 | ​ |  | 6
Benefits paid | ​ |  | (7) | ​ |  | (7)
Actuarial loss | ​ |  | 11 | ​ |  | 11
Currency translation | ​ |  | 3 | ​ |  | (2)
Benefit obligation, end of year | ​ |  | 166 | ​ |  | 154
Change in plan assets: | ​ |  |  | ​ |  |
Fair value of plan assets, beginning of year | ​ |  | 90 | ​ |  | 77
Actual return on plan assets | ​ |  | 10 | ​ |  | 15
Employer contributions | ​ |  | 1 | ​ |  | 5
Benefits paid | ​ |  | (7) | ​ |  | (7)
Fair value of plan assets, end of year | ​ |  | 94 | ​ |  | 90
Funded status of the plan and amounts recognized in the consolidated balance sheets | ​ | $ | (72) | ​ | $ | (64)
​ Defined Benefit Plans Measured at Fair Value on a Recurring Basis The following table presents Viskase’s defined benefit plan assets measured at fair value on a recurring basis: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019
​ |  | Level 1 |  | Level 2 |  | Total |  | Level 1 |  | Level 2 |  | Total
​ | ​ | (in millions)
U.S. and Non-U.S. Plans: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Cash and cash equivalents | ​ | $ | 7 | ​ | $ | — | ​ | $ | 7 | ​ | $ | 3 | ​ | $ | — | ​ | $ | 3
Government debt securities | ​ |  | 3 | ​ |  | 6 | ​ |  | 9 | ​ |  | 1 | ​ |  | 2 | ​ |  | 3
Exchange traded funds | ​ |  | 13 | ​ |  | — | ​ |  | 13 | ​ |  | 18 | ​ |  | — | ​ |  | 18
Mutual funds | ​ |  | 40 | ​ |  | 2 | ​ |  | 42 | ​ |  | 26 | ​ |  | 2 | ​ |  | 28
Common stock | ​ |  | 23 | ​ |  | — | ​ |  | 23 | ​ |  | 27 | ​ |  | — | ​ |  | 27
​ | ​ | $ | 86 | ​ | $ | 8 | ​ | $ | 94 | ​ | $ | 75 | ​ | $ | 4 | ​ | $ | 79
Investments measured at net asset value | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | — | ​ |  | ​ | ​ | ​ | ​ | ​ |  | 11
Plan assets measured at fair value | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 94 | ​ |  | ​ | ​ | ​ | ​ | ​ | $ | 90
​

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- Definition Pension, Other Post-Retirement Benefits and Employee Benefit Plans. [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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