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Risk Management - Summary of the Effect of Unconditional Netting (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments | $ 8,780 | $ 8,877
Credit Linked Note [member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments | 679 | 461
Amounts subject to an enforceable netting arrangement | (679) | (461)
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position | 0 | 0
Variable Funding Surplus Note [member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments | (679) | (461)
Amounts subject to an enforceable netting arrangement | 679 | 461
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position | $ 0 | $ 0

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