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Risk Management - Summary of the Effect of Unconditional Netting (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Credit Linked Note [member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments | $ 932 | $ 782
Amounts subject to an enforceable netting arrangement | (932) | (782)
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position |  |
Variable Funding Surplus Note [member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments | (932) | 782
Amounts subject to an enforceable netting arrangement | 932 | $ 782
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position |  |

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