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Financial Instrument Risk Management - Past Due and Impaired Mortgages and Loans (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 168,785 $ 152,785
Mortgages:    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 15,428 16,225
Mortgages: | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 15,494 16,295
Mortgages: | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 66 70
Mortgages: | Not past due | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 15,402 16,148
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: | Impaired | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 92 147
Mortgages: | Impaired | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 66 70
Loans    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 34,518 31,997
Loans | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 34,567 32,044
Loans | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 49 47
Loans | Not past due | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 34,486 31,911
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 | Impaired | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 81 133
Loans | Impaired | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 49 47
Total    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 49,946 48,222
Total | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 50,061 48,339
Total | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 115 117
Total | Not past due | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 49,888 48,059
Total | Not past due | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Total | Impaired | Gross carrying value    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 173 280
Total | Impaired | Allowance for losses    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 115 $ 117