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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, 2019 | Dec. 31, 2018
Employee Benefit Plan |  |
Investment funds |  |
Money market | 2.00% | 2.00%
Canadian fixed income | 98.00% | 98.00%
Total | 100.00% | 100.00%
SERP |  |
Investment funds |  |
Money market | 7.00% | 1.00%
Canadian fixed income | 0.00% | 6.00%
Other | 93.00% | 49.00%
Total | 100.00% | 100.00%
SERP | Canada |  |
Investment funds |  |
Equities | 0.00% | 22.00%
SERP | UNITED STATES |  |
Investment funds |  |
Equities | 0.00% | 10.00%
SERP | International equities |  |
Investment funds |  |
Equities | 0.00% | 12.00%

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- Definition Percentage of fixed income 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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