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Financial Instrument Risk Management - Debt Securities by Geographic Location (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]    
Financial assets $ 143,061 $ 137,691
Debt securities    
Disclosure of geographical areas [line items]    
Financial assets 74,443 72,619
Debt securities | Canada    
Disclosure of geographical areas [line items]    
Financial assets 29,308 28,246
Debt securities | United States    
Disclosure of geographical areas [line items]    
Financial assets 27,246 26,477
Debt securities | United Kingdom    
Disclosure of geographical areas [line items]    
Financial assets 5,657 5,909
Debt securities | Other countries    
Disclosure of geographical areas [line items]    
Financial assets 12,232 11,987
Fair value through profit or loss | Debt securities    
Disclosure of geographical areas [line items]    
Financial assets 61,402 59,967
Fair value through profit or loss | Debt securities | Canada    
Disclosure of geographical areas [line items]    
Financial assets 25,091 24,132
Fair value through profit or loss | Debt securities | United States    
Disclosure of geographical areas [line items]    
Financial assets 21,329 20,758
Fair value through profit or loss | Debt securities | United Kingdom    
Disclosure of geographical areas [line items]    
Financial assets 5,092 5,319
Fair value through profit or loss | Debt securities | Other countries    
Disclosure of geographical areas [line items]    
Financial assets 9,890 9,758
Available-for- sale | Debt securities    
Disclosure of geographical areas [line items]    
Financial assets 13,041 12,652
Available-for- sale | Debt securities | Canada    
Disclosure of geographical areas [line items]    
Financial assets 4,217 4,114
Available-for- sale | Debt securities | United States    
Disclosure of geographical areas [line items]    
Financial assets 5,917 5,719
Available-for- sale | Debt securities | United Kingdom    
Disclosure of geographical areas [line items]    
Financial assets 565 590
Available-for- sale | Debt securities | Other countries    
Disclosure of geographical areas [line items]    
Financial assets $ 2,342 $ 2,229