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Risk Management - Summary of Credit Default Swap Protection Sold (Detail) - CAD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items]    
Notional amount $ 414,734,000,000 $ 336,773,000,000
Credit default swaps [Member]    
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items]    
Notional amount 652,000,000 606,000,000
Fair value $ 9,000,000 $ 14,000,000
Weighted average maturity (in years) 2 years 3 years
Credit default swaps [Member] | AAA [Member]    
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items]    
Notional amount   $ 13,000,000
Weighted average maturity (in years)   1 year
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 $ 25,000,000 $ 35,000,000
Fair value   $ 1,000,000
Weighted average maturity (in years) 2 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 $ 447,000,000 $ 408,000,000
Fair value $ 7,000,000 $ 10,000,000
Weighted average maturity (in years) 2 years 3 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 $ 180,000,000 $ 150,000,000
Fair value $ 2,000,000 $ 3,000,000
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 $ 652,000,000 $ 606,000,000
Fair value $ 9,000,000 $ 14,000,000
Weighted average maturity (in years) 2 years 3 years