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Summary of Change in Accumulated Other Comprehensive Income (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
(Charge) credit to other comprehensive income, before tax	$ (522)	$ 402	$ 120
Deferred income tax (charge) credit (note 18)	128	(104)	(38)
(Charge) credit to other comprehensive income, after tax	$ (394)	$ 298	$ 82

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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