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Post-employment benefits for associates - Weighted average plan asset allocation (Details) - Pension plans [member] | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 31.00% | 32.00%
Debt securities | 46.00% | 42.00%
Real estate | 7.00% | 7.00%
Alternative investments | 10.00% | 15.00%
Cash and other investments | 6.00% | 4.00%
Total | 100.00% | 100.00%
Minimum [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities, target | 15.00% |
Debt securities, target | 20.00% |
Real estate, target | 5.00% |
Alternative investments, target | 0.00% |
Cash and other investments, target | 0.00% |
Maximum [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities, target | 40.00% |
Debt securities, target | 60.00% |
Real estate, target | 20.00% |
Alternative investments, target | 20.00% |
Cash and other investments, target | 15.00% |

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