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Employee benefits - Discount rate and assumed health care cost trend rates (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plans | Minimum |  |  |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 2.79% | 2.41% | 3.22%
Discount rate for interest cost | 2.30% | 1.76% | 2.81%
Expected return on plan asset | 4.30% | 4.60% | 5.00%
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 5.34% | 2.79% |
Pension Plans | Maximum |  |  |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 2.83% | 2.48% | 3.27%
Discount rate for interest cost | 2.33% | 1.80% | 2.83%
Expected return on plan asset | 5.40% | 5.50% | 5.80%
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 5.37% | 2.83% |
OPEB Plan |  |  |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 2.94% | 2.65% | 3.38%
Discount rate for service cost | 3.21% | 3.09% | 3.72%
Discount rate for interest cost | 2.51% | 2.03% | 2.98%
Initial health care cost trend rates | 4.75% | 5.00% | 5.00%
Ultimate health care cost trend rate | 4.50% | 4.50% | 5.00%
Year that the ultimate trend rate is reached | 2023 | 2023 | 2020
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 5.42% | 2.94% |
Initial health care cost trend rates | 7.50% | 4.75% |
Ultimate health care cost trend rate | 4.50% | 4.50% |
Year that the ultimate trend rate is reached | 2035 | 2023 |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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