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Employee Future Benefits - Summary of Potential Impact on Obligations Arising From Changes in Key Assumptions (Detail) CAD in Millions	Dec. 31, 2017 CAD
Actuarial assumption of discount rates [Member] | Pension plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Impact of increase in actuarial assumption	CAD (451)
Impact of decrease in actuarial assumption	536
Actuarial assumption of discount rates [Member] | Retiree welfare plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Impact of increase in actuarial assumption	(67)
Impact of decrease in actuarial assumption	82
Actuarial assumption of medical cost trend rates [Member] | Retiree welfare plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Impact of increase in actuarial assumption	24
Impact of decrease in actuarial assumption	(21)
Actuarial assumption of decrease in inflation rates [Member] | Pension plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Impact of decrease in actuarial assumption	119
Actuarial assumption of decrease in inflation rates [Member] | Retiree welfare plans [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Impact of decrease in actuarial assumption	CAD 16

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- Definition

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+ References

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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

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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

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