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Financial Instrument Risk Management - Debt Securities by Geographic Location (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of geographical areas [line items]    
Financial assets $ 173,735 $ 168,785
Debt securities    
Disclosure of geographical areas [line items]    
Financial assets 88,727 89,089
Debt securities | Canada    
Disclosure of geographical areas [line items]    
Financial assets 38,163 38,690
Debt securities | United States    
Disclosure of geographical areas [line items]    
Financial assets 31,230 31,167
Debt securities | United Kingdom    
Disclosure of geographical areas [line items]    
Financial assets 4,758 5,079
Debt securities | Other countries    
Disclosure of geographical areas [line items]    
Financial assets 14,576 14,153
Fair value through profit or loss | Debt securities    
Disclosure of geographical areas [line items]    
Financial assets 75,998 77,834
Fair value through profit or loss | Debt securities | Canada    
Disclosure of geographical areas [line items]    
Financial assets 33,028 34,005
Fair value through profit or loss | Debt securities | United States    
Disclosure of geographical areas [line items]    
Financial assets 26,678 27,183
Fair value through profit or loss | Debt securities | United Kingdom    
Disclosure of geographical areas [line items]    
Financial assets 4,196 4,592
Fair value through profit or loss | Debt securities | Other countries    
Disclosure of geographical areas [line items]    
Financial assets 12,096 12,054
Available- for-sale | Debt securities    
Disclosure of geographical areas [line items]    
Financial assets 12,729 11,255
Available- for-sale | Debt securities | Canada    
Disclosure of geographical areas [line items]    
Financial assets 5,135 4,685
Available- for-sale | Debt securities | United States    
Disclosure of geographical areas [line items]    
Financial assets 4,552 3,984
Available- for-sale | Debt securities | United Kingdom    
Disclosure of geographical areas [line items]    
Financial assets 562 487
Available- for-sale | Debt securities | Other countries    
Disclosure of geographical areas [line items]    
Financial assets $ 2,480 $ 2,099