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Pension Plans and Other Post-Retirement Benefits - Schedule of Sensitivity Analysis (Details) $ in Millions	Dec. 31, 2018 CAD ($)
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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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]]

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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]]

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