The following table sets forth the net periodic pension cost for our defined benefit pension plans. The components of our net periodic pension costs consisted of the following (dollars in millions): | | | | | | | | | | | | | | | | | | | Year Ended December 31, | | 2022 | | 2021 | | 2020 | Service cost | $ | 3 | | | $ | 1 | | | $ | 1 | | Other components of net periodic pension cost: | | | | | | Interest cost | 7 | | | 7 | | | 9 | | Expected return on plan assets | (7) | | | (13) | | | (14) | | Amortization of prior service cost and net transition asset | 1 | | | 1 | | | 1 | | Amortization of net actuarial loss | 5 | | | 6 | | | 6 | | Net periodic pension cost before loss due to settlement | 8 | | | 2 | | | 2 | | Loss due to pension settlement | 82 | | | 2 | | | — | | Total net periodic pension cost | $ | 91 | | | $ | 4 | | | $ | 2 | | | | | | | | Net periodic pension cost included in cost of sales | $ | — | | | $ | — | | | $ | — | | Net periodic pension cost included in selling, general, and administrative expenses | 3 | | | 1 | | | 1 | | Net periodic pension cost included in other non-operating items | 88 | | | 3 | | | 1 | | | $ | 91 | | | $ | 4 | | | $ | 2 | |
Weighted average assumptions used to calculate our net periodic pension costs for the years ended December 31, 2022, 2021, and 2020 were as follows: | | | | | | | | | | | | | | | | | | | 2022 | | 2021 | | 2020 | Discount rate: | | | | | | U.S. | 2.6 | % | | 2.3 | % | | 3.1 | % | Canada | 2.6 | % | | 2.3 | % | | 3.0 | % | | | | | | | Expected return on plan assets: | | | | | | U.S. | 3.0 | % | | 5.3 | % | | 5.8 | % | Canada | 2.0 | % | | 2.3 | % | | 3.2 | % | | | | | | | Rate of compensation increase: | | | | | | U.S. | NA | | NA | | NA | Canada | NA | | NA | | 3.5 | % | | | | | | |
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