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Pension Plans and Other Post-Retirement Benefits - Schedule of Sensitivity Analysis (Details) $ in Millions | Dec. 31, 2018 CAD ($)
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Interest/discount rate sensitivity |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible decrease in actuarial assumption | 1.00%
Percentage of reasonably possible increase in actuarial assumption | 1.00%
Rate of compensation increase assumption |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible decrease in actuarial assumption | 1.00%
Percentage of reasonably possible increase in actuarial assumption | 1.00%
Health care trend rate assumption |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible decrease in actuarial assumption | 1.00%
Percentage of reasonably possible increase in actuarial assumption | 1.00%
Mortality rates |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible decrease in actuarial assumption | 10.00%
Pension | Interest/discount rate sensitivity |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 644
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (500)
Pension | Rate of compensation increase assumption |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (75)
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 78
Pension | Mortality rates |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 89
Other post-retirement | Interest/discount rate sensitivity |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 33
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (28)
Other post-retirement | Health care trend rate assumption |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (13)
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 15
Other post-retirement | Mortality rates |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 6

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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