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Financial Instrument Risk Management - Mortgages and Loans by Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of external credit grades [line items]    
Financial assets $ 143,061 $ 137,691
Mortgages    
Disclosure of external credit grades [line items]    
Financial assets 16,433 15,493
Mortgages | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 16,433 15,493
Mortgages | Credit risk | Insured    
Disclosure of external credit grades [line items]    
Financial assets 3,537 3,171
Mortgages | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 3 4
Mortgages | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 2,209 1,716
Mortgages | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 4,841 4,304
Mortgages | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 4,925 5,060
Mortgages | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets 912 1,227
Mortgages | Credit risk | Impaired    
Disclosure of external credit grades [line items]    
Financial assets 6 11
Loans    
Disclosure of external credit grades [line items]    
Financial assets 30,389 27,312
Loans | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 30,389 27,312
Loans | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 341 400
Loans | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 4,659 3,670
Loans | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 11,483 11,626
Loans | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 12,766 10,745
Loans | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets 1,097 810
Loans | Credit risk | Impaired    
Disclosure of external credit grades [line items]    
Financial assets $ 43 $ 61