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Financial Instrument Risk Management - Debt Securities by Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of external credit grades [line items]    
Financial assets $ 168,785 $ 152,785
Debt securities | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 89,089 81,606
Debt securities | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 17,604 17,727
Debt securities | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 13,456 12,173
Debt securities | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 33,412 30,378
Debt securities | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 23,294 20,587
Debt securities | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets 1,323 741
Fair value through profit or loss | Debt securities | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 77,834 67,894
Fair value through profit or loss | Debt securities | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 12,794 11,097
Fair value through profit or loss | Debt securities | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 11,870 10,503
Fair value through profit or loss | Debt securities | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 30,812 27,341
Fair value through profit or loss | Debt securities | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 21,203 18,339
Fair value through profit or loss | Debt securities | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets 1,155 614
Available-for-sale | Debt securities | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 11,255 13,712
Available-for-sale | Debt securities | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 4,810 6,630
Available-for-sale | Debt securities | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 1,586 1,670
Available-for-sale | Debt securities | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 2,600 3,037
Available-for-sale | Debt securities | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 2,091 2,248
Available-for-sale | Debt securities | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets $ 168 $ 127