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Employee benefit plans - Summary of defined benefit plans' weighted average asset allocation percentages by asset category (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Employee benefit plans |  |
Investment funds |  |
Money market | 0.00% | 2.00%
Canadian fixed income | 0.00% | 98.00%
Other | 0.00% | 0.00%
Total | 0.00% | 100.00%
Employee benefit plans | Canada |  |
Investment funds |  |
Equities | 0.00% | 0.00%
Employee benefit plans | UNITED STATES |  |
Investment funds |  |
Equities | 0.00% | 0.00%
Employee benefit plans | Other jurisdictions |  |
Investment funds |  |
Equities | 0.00% | 0.00%
SERP |  |
Investment funds |  |
Money market | 80.00% | 7.00%
Canadian fixed income | 0.00% | 0.00%
Other | 20.00% | 93.00%
Total | 100.00% | 100.00%
SERP | Canada |  |
Investment funds |  |
Equities | 0.00% | 0.00%
SERP | UNITED STATES |  |
Investment funds |  |
Equities | 0.00% | 0.00%
SERP | Other jurisdictions |  |
Investment funds |  |
Equities | 0.00% | 0.00%

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- Definition Investment Securities [abstract] + References No definition available. + Details
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- Definition The percentage of equity interest to be transferred. + References No definition available. + Details
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- Definition Percentage of fixed income securities. + References No definition available. + Details
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- Definition Percentage of other securities. + References No definition available. + Details
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- Definition Percentage of money market securities. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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