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Financial Instrument Risk Management - Mortgages and Loans 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
Mortgages:    
Disclosure of external credit grades [line items]    
Financial assets 16,225 16,433
Mortgages: | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 16,225 16,433
Mortgages: | Credit risk | Insured    
Disclosure of external credit grades [line items]    
Financial assets 3,966 3,537
Mortgages: | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 1 3
Mortgages: | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 2,087 2,209
Mortgages: | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 5,481 4,841
Mortgages: | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 3,943 4,925
Mortgages: | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets 670 912
Mortgages: | Credit risk | Impaired    
Disclosure of external credit grades [line items]    
Financial assets 77 6
Loans    
Disclosure of external credit grades [line items]    
Financial assets 31,997 30,389
Loans | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 31,997 30,389
Loans | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 224 341
Loans | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 5,044 4,659
Loans | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 12,516 11,483
Loans | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 12,920 12,766
Loans | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets 1,207 1,097
Loans | Credit risk | Impaired    
Disclosure of external credit grades [line items]    
Financial assets $ 86 $ 43