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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Plans |  |  |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Expected return on plan asset |  |  | 6.50%
Pension Plans | Minimum |  |  |
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 3.22% | 4.20% |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 4.20% | 3.54% | 3.98%
Discount rate for interest cost | 3.87% | 3.16% | 3.35%
Expected return on plan asset | 5.30% | 5.50% |
Pension Plans | Maximum |  |  |
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 3.27% | 4.23% |
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 4.23% | 3.56% | 4.02%
Discount rate for interest cost | 3.90% | 3.20% | 3.42%
Expected return on plan asset | 6.00% | 6.00% |
OPEB Plan |  |  |
Weighted average assumptions used to determine benefit obligation at December 31: |  |  |
Discount rate for benefit obligation | 3.38% | 4.30% |
Initial health care cost trend rates | 5.00% | 5.00% |
Ultimate health care cost trend rate | 5.00% | 5.00% | 5.00%
Year that the ultimate trend rate is reached | 2019 | 2019 | 2019
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate for benefit obligation | 4.30% | 3.62% | 4.10%
Discount rate for service cost | 4.49% | 3.74% | 4.30%
Discount rate for interest cost | 3.99% | 3.32% | 3.58%
Initial health care cost trend rates | 5.00% | 5.50% | 6.00%
Ultimate health care cost trend rate | 5.00% | 5.00% | 5.00%
Year that the ultimate trend rate is reached | 2019 | 2019 | 2019

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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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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement 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 (l) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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