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Risk Management - Summary of Credit Default Swap Protection Sold (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items]    
Notional amount $ 440,098 $ 418,978
Credit default swaps [Member]    
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items]    
Notional amount 44 241
Fair value $ 1 $ 3
Weighted average maturity (in years) 2 years 1 year
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 $ 16 $ 136
Fair value   $ 2
Weighted average maturity (in years) 1 year 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 $ 28 $ 105
Fair value $ 1 $ 1
Weighted average maturity (in years) 2 years 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 $ 44 $ 241
Fair value $ 1 $ 3
Weighted average maturity (in years) 2 years 1 year