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Financial Instrument Risk Management - Debt Securities by Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of external credit grades [line items]    
Financial assets $ 152,785 $ 143,061
Debt securities | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 81,606 74,443
Debt securities | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 17,727 15,647
Debt securities | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 12,173 16,252
Debt securities | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 30,378 21,536
Debt securities | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 20,587 20,129
Debt securities | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets 741 879
Fair value through profit or loss | Debt securities | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 67,894 61,402
Fair value through profit or loss | Debt securities | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 11,097 9,728
Fair value through profit or loss | Debt securities | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 10,503 14,208
Fair value through profit or loss | Debt securities | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 27,341 19,089
Fair value through profit or loss | Debt securities | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 18,339 17,646
Fair value through profit or loss | Debt securities | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets 614 731
Available-for-sale | Debt securities | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 13,712 13,041
Available-for-sale | Debt securities | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 6,630 5,919
Available-for-sale | Debt securities | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 1,670 2,044
Available-for-sale | Debt securities | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 3,037 2,447
Available-for-sale | Debt securities | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 2,248 2,483
Available-for-sale | Debt securities | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets $ 127 $ 148