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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Plans | Minimum |  |  |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 3.22% | 4.20% | 3.54%
Discount rate for interest cost | 2.81% | 3.87% | 3.16%
Expected return on plan asset | 5.00% | 5.30% | 5.50%
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 2.41% | 3.22% |
Pension Plans | Maximum |  |  |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 3.27% | 4.23% | 3.56%
Discount rate for interest cost | 2.83% | 3.90% | 3.20%
Expected return on plan asset | 5.80% | 6.00% | 6.00%
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 2.48% | 3.27% |
OPEB Plan |  |  |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 3.38% | 4.30% | 3.62%
Discount rate for service cost | 3.72% | 4.49% | 3.74%
Discount rate for interest cost | 2.98% | 3.99% | 3.32%
Initial health care cost trend rates | 5.00% | 5.00% | 5.50%
Ultimate health care cost trend rate | 5.00% | 5.00% | 5.00%
Year that the ultimate trend rate is reached | 2020 | 2019 | 2019
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 2.65% | 3.38% |
Initial health care cost trend rates | 5.00% | 5.00% |
Ultimate health care cost trend rate | 4.50% | 5.00% |
Year that the ultimate trend rate is reached | 2023 | 2019 |

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- Definition The initial trend rate for health care costs using the assumption to calculate net periodic benefit cost + References No definition available. + Details
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- Definition The service cost rate used to adjust for the time value of money for the plan. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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