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Financial Instrument Risk Management - Past Due and Impaired Mortgages and Loans (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 143,061 $ 137,691
Mortgages    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 16,433 15,493
Mortgages | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 16,458 15,515
Mortgages | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 25 22
Mortgages | Not past due | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 16,427 15,482
Mortgages | Not past due | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Mortgages | Past due | Gross carrying value | Past due less than 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Mortgages | Past due | Gross carrying value | Later than three months [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Mortgages | Past due | Allowance for losses | Past due less than 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Mortgages | Past due | Allowance for losses | Later than three months [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Mortgages | Impaired | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 31 33
Mortgages | Impaired | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 25 22
Loans    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 30,389 27,312
Loans | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 30,439 27,340
Loans | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 50 28
Loans | Not past due | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 30,332 27,180
Loans | Not past due | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Loans | Past due | Gross carrying value | Past due less than 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 14 71
Loans | Past due | Gross carrying value | Later than three months [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Loans | Past due | Allowance for losses | Past due less than 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Loans | Past due | Allowance for losses | Later than three months [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Loans | Impaired | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 93 89
Loans | Impaired | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 50 28
Mortgages and loans    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 46,822 42,805
Mortgages and loans | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 46,897 42,855
Mortgages and loans | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 75 50
Mortgages and loans | Not past due | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 46,759 42,662
Mortgages and loans | Not past due | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Mortgages and loans | Past due | Gross carrying value | Past due less than 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 14 71
Mortgages and loans | Past due | Gross carrying value | Later than three months [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Mortgages and loans | Past due | Allowance for losses | Past due less than 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Mortgages and loans | Past due | Allowance for losses | Later than three months [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Mortgages and loans | Impaired | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 124 122
Mortgages and loans | Impaired | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 75 $ 50