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Insurance Contract Liabilities and Reinsurance Assets - Summary of Gross Claims and Benefits (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items] |  |
Gross claims and benefits | $ 33,320 | $ 31,110
Death, disability and other claims [Member] |  |
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items] |  |
Gross claims and benefits | 19,404 | 18,583
Maturity and surrender benefits [Member] |  |
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items] |  |
Gross claims and benefits | 10,662 | 8,728
Annuity payments [Member] |  |
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items] |  |
Gross claims and benefits | 3,242 | 3,276
Policyholder dividends and experience rating refunds [Member] |  |
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items] |  |
Gross claims and benefits | 1,279 | 1,255
Net transfers from segregated funds [Member] |  |
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items] |  |
Gross claims and benefits | $ (1,267) | $ (732)

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