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Post-employee benefit plans - Helathcare cost trend rates and sensitivity analysis (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 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 | $ 7
Impact on net post-employment benefit plans cost, decrease in assumption | (5)
Impact on post-employment benefit obligation, increase in assumption | 133
Impact on post-employment benefit obligation, decrease in assumption | $ (115)
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 | $ (70)
Impact on net post-employment benefit plans cost, decrease in assumption | 62
Impact on post-employment benefit obligation, increase in assumption | (1,636)
Impact on post-employment benefit obligation, decrease in assumption | 1,746
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 | 33
Impact on net post-employment benefit plans cost, decrease in assumption | (31)
Impact on post-employment benefit obligation, increase in assumption | 834
Impact on post-employment benefit obligation, decrease in assumption | $ (808)
Duration of reasonably possible decrease in actuarial assumptions | 1 year
Duration of reasonably possible increase in actuarial assumption | 1 year

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