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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plans | Minimum |  |  |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 5.34% | 2.79% | 2.41%
Discount rate for interest cost | 5.23% | 2.30% | 1.76%
Expected return on plan asset | 5.90% | 4.30% | 4.60%
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 5.02% | 5.34% |
Pension Plans | Maximum |  |  |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 5.37% | 2.83% | 2.48%
Discount rate for interest cost | 5.24% | 2.33% | 1.80%
Expected return on plan asset | 6.50% | 5.40% | 5.50%
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 5.05% | 5.37% |
OPEB Plan |  |  |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 5.42% | 2.94% | 2.65%
Discount rate for service cost | 5.66% | 3.21% | 3.09%
Discount rate for interest cost | 5.28% | 2.51% | 2.03%
Initial health care cost trend rates | 7.50% | 4.75% | 5.00%
Ultimate health care cost trend rate | 4.50% | 4.50% | 4.50%
Year that the ultimate trend rate is reached | 2035 | 2023 | 2023
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 5.10% | 5.42% |
Initial health care cost trend rates | 7.25% | 7.50% |
Ultimate health care cost trend rate | 4.50% | 4.50% |
Year that the ultimate trend rate is reached | 2035 | 2035 |

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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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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