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Invested Assets and Investment Income - Summary of Securitized Assets and Secured Borrowing Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | $ 3,818 | $ 3,512
SecuredBorrowingLiabilities | 3,774 | 3,523
HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 2,293 | 2,032
CMB securitization [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 1,525 | 1,480
Securitized mortgages [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 3,810 | 3,504
Securitized mortgages [Member] | HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 2,285 | 2,024
Securitized mortgages [Member] | CMB securitization [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 1,525 | 1,480
Restricted cash and short-term securities [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 8 | 8
Restricted cash and short-term securities [member] | HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
Securitised Assets | 8 | 8
HELOC securitization [Member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
SecuredBorrowingLiabilities | 2,250 | 2,000
CMB securitization [member] |  |
Disclosure of securitized assets, mortgages and associated liabilities [line items] |  |
SecuredBorrowingLiabilities | $ 1,524 | $ 1,523

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- Definition Disclosure of securitized assets, mortgages and associated liabilities [line items] + References No definition available. + Details
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