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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, 2018 | Dec. 31, 2017
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items] |  |
Gross claims and benefits | $ 27,878 | $ 24,994
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 | 15,174 | 14,871
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 | 7,722 | 6,302
Annuity payments [Member] |  |
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [Line Items] |  |
Gross claims and benefits | 4,262 | 4,470
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 | 1,809 | 1,085
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 | $ (1,089) | $ (1,734)

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