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Post-employee benefit plans - Healthcare Cost Trend Rates and Sensitivity Analysis (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 CAD ($)
Actuarial assumption of medical cost trend rates |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible increase in actuarial assumption | 1.00%
Percentage of reasonably possible decrease in actuarial assumption | 1.00%
Impact on net post-employment benefit plans cost, increase in assumption | $ 3
Impact on net post-employment benefit plans cost, decrease in assumption | (3)
Impact on post-employment benefit obligation, increase in assumption | 110
Impact on post-employment benefit obligation, decrease in assumption | $ (95)
Actuarial assumption of discount rates |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible increase in actuarial assumption | 0.50%
Percentage of reasonably possible decrease in actuarial assumption | 0.50%
Impact on net post-employment benefit plans cost, increase in assumption | $ (76)
Impact on net post-employment benefit plans cost, decrease in assumption | 64
Impact on post-employment benefit obligation, increase in assumption | (1,897)
Impact on post-employment benefit obligation, decrease in assumption | 2,127
Actuarial assumption of life expectancy |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Impact on net post-employment benefit plans cost, increase in assumption | 38
Impact on net post-employment benefit plans cost, decrease in assumption | (38)
Impact on post-employment benefit obligation, increase in assumption | 1,092
Impact on post-employment benefit obligation, decrease in assumption | $ (1,092)
Duration of reasonably possible decrease in actuarial assumptions | 1 year
Duration of reasonably possible increase in actuarial assumption | 1 year

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