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Risk Management - Summary of Credit Default Swap Protection Sold (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | $ 395,957 | $ 440,098
Credit default swaps [Member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | 159 | 44
Fair value | $ 4 | $ 1
Weighted average maturity (in years) | 4 years | 2 years
Credit default swaps [Member] | A [Member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | $ 133 | $ 16
Fair value | $ 4 |
Weighted average maturity (in years) | 4 years | 1 year
Credit default swaps [Member] | BBB [Member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | $ 26 | $ 28
Fair value |  | $ 1
Weighted average maturity (in years) | 1 year | 2 years
Credit default swaps [Member] | Single name CDSs [Member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | $ 159 | $ 44
Fair value | $ 4 | $ 1
Weighted average maturity (in years) | 4 years | 2 years

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