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Risk Management - Summary of Credit Default Swap Protection Sold (Detail) - CAD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items]    
Notional amount $ 440,077,000,000 $ 395,957,000,000
Credit default swaps [Member]    
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items]    
Notional amount 131,000,000 159,000,000
Fair value $ 3,000,000 $ 4,000,000
Weighted average maturity (in years) 3 years 4 years
Credit default swaps [Member] | AA [Member]    
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items]    
Notional amount $ 23,000,000  
Fair value $ 1,000,000  
Weighted average maturity (in years) 4 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 $ 94,000,000 $ 133,000,000
Fair value $ 2,000,000 $ 4,000,000
Weighted average maturity (in years) 3 years 4 years
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 $ 14,000,000 $ 26,000,000
Fair value $ 0  
Weighted average maturity (in years) 1 year 1 year
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 $ 131,000,000 $ 159,000,000
Fair value $ 3,000,000 $ 4,000,000
Weighted average maturity (in years) 3 years 4 years