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Derivative and Hedging Instruments - Summary of Effects of Derivatives in Cash Flow Hedging Relationships (Detail) - Cash flow hedges [Member] - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about hedges [Line Items]
Gains (losses) deferred in AOCI on derivatives	$ 210	$ 74
Gains (losses) reclassified from AOCI into investment income	(9)	(14)
Foreign currency swaps [Member] | Fixed rate assets [Member]
Disclosure of detailed information about hedges [Line Items]
Gains (losses) deferred in AOCI on derivatives	(1)	(1)
Gains (losses) reclassified from AOCI into investment income	(1)	(1)
Foreign currency swaps [Member] | Floating rate liabilities [Member]
Disclosure of detailed information about hedges [Line Items]
Gains (losses) deferred in AOCI on derivatives	175	89
Gains (losses) reclassified from AOCI into investment income	(49)	3
Foreign currency swaps [Member] | Fixed rate liabilities [Member]
Disclosure of detailed information about hedges [Line Items]
Gains (losses) deferred in AOCI on derivatives	34	(19)
Gains (losses) reclassified from AOCI into investment income	35	(21)
Equity contracts [Member] | Stock-based compensation [Member]
Disclosure of detailed information about hedges [Line Items]
Gains (losses) deferred in AOCI on derivatives	2	5
Gains (losses) reclassified from AOCI into investment income	$ 6	$ 5

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