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Financial Instrument Risk Management - Past Due and Impaired Mortgages and Loans (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 152,785 $ 143,061
Mortgages:    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 16,225 16,433
Mortgages: | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 16,295 16,458
Mortgages: | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 70 25
Mortgages: | Not past due | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 16,148 16,427
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
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
Mortgages: | Impaired | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 147 31
Mortgages: | Impaired | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 70 25
Loans    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 31,997 30,389
Loans | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 32,044 30,439
Loans | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 47 50
Loans | Not past due | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 31,911 30,332
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
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
Loans | Impaired | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 133 93
Loans | Impaired | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 47 50
Mortgages and loans(1)    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 48,222 46,822
Mortgages and loans(1) | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 48,339 46,897
Mortgages and loans(1) | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 117 75
Mortgages and loans(1) | Not past due | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 48,059 46,759
Mortgages and loans(1) | 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(1) | 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
Mortgages and loans(1) | 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
Mortgages and loans(1) | Impaired | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 280 124
Mortgages and loans(1) | Impaired | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 117 $ 75