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Derivative and Hedging Instruments - Summary of Effects of Net Investment Hedging Relationships (Detail) - Hedges of net investment in foreign operations [Member] - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about hedges [Line Items]
Gains (losses) deferred in AOCI on derivatives	$ 120	$ 108
Forward contracts [Member]
Disclosure of detailed information about hedges [Line Items]
Gains (losses) deferred in AOCI on derivatives	59	(53)
Non-functional currency denominated debt [Member]
Disclosure of detailed information about hedges [Line Items]
Gains (losses) deferred in AOCI on derivatives	$ 61	$ 161

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Gains (losses) deferred in accumulated other comprehensive income on derivatives.

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