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employee future benefits - Plan investment strategies and policies (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Pension plans |  |
employee future benefits |  |
Present value-weighted average timing of estimate cash flows for obligations (in years) | 14 years 1 month 6 days | 13 years 8 months 12 days
Percentage of plan assets at end of year | 100.00% | 100.00%
Pension plans | Equity |  |
employee future benefits |  |
Percentage of plan assets at end of year | 38.00% | 36.00%
Pension plans | Equity | Minimum |  |
employee future benefits |  |
Target future allocation | 25.00% |
Pension plans | Equity | Maximum |  |
employee future benefits |  |
Target future allocation | 55.00% |
Pension plans | Equity | Foreign | Minimum |  |
employee future benefits |  |
Target future allocation | 20.00% |
Pension plans | Equity | Foreign | Maximum |  |
employee future benefits |  |
Target future allocation | 30.00% |
Pension plans | Debt securities |  |
employee future benefits |  |
Percentage of plan assets at end of year | 51.00% | 53.00%
Pension plans | Debt securities | Minimum |  |
employee future benefits |  |
Target future allocation | 40.00% |
Pension plans | Debt securities | Maximum |  |
employee future benefits |  |
Target future allocation | 75.00% |
Pension plans | Real estate |  |
employee future benefits |  |
Percentage of plan assets at end of year | 11.00% | 11.00%
Pension plans | Real estate | Minimum |  |
employee future benefits |  |
Target future allocation | 10.00% |
Pension plans | Real estate | Maximum |  |
employee future benefits |  |
Target future allocation | 30.00% |
Pension plans | Other assets | Minimum |  |
employee future benefits |  |
Target future allocation | 0.00% |
Pension plans | Other assets | Maximum |  |
employee future benefits |  |
Target future allocation | 15.00% |
Other defined benefit plans |  |
employee future benefits |  |
Present value-weighted average timing of estimate cash flows for obligations (in years) | 5 years 9 months 18 days | 6 years 2 months 12 days

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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_147_c&doctype=Standard -URIDate 2020-01-01 + Details
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