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Accounting and Reporting Changes - Additional Information (Detail) - CAD ($) $ in Millions | Jan. 01, 2023 | Jan. 01, 2022
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Disclosure of changes in accounting estimates [line items] |  |
Increase (decrease) in equity |  | $ 15,766
Contractual service margin liability |  | 21,466
Debt securities [member] |  |
Disclosure of changes in accounting estimates [line items] |  |
Reclassification of financial assets out of measured at fair value through profit or loss into measured at fair value through other comprehensive income | $ 184,000 |
IFRS 17 [member] |  |
Disclosure of changes in accounting estimates [line items] |  |
Increase (decrease) in equity |  | $ 11,997

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