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Financial Instrument Risk Management - Changes in Allowances for Losses (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Mortgages:    
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Allowance account for credit losses of financial assets, beginning balance $ 70 $ 25
Provision for (reversal of) losses 6 46
Write-offs, net of recoveries, and other adjustments (9)  
Foreign exchange rate movements (1) (1)
Allowance account for credit losses of financial assets, ending balance 66 70
Loans    
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Allowance account for credit losses of financial assets, beginning balance 47 50
Provision for (reversal of) losses   (1)
Provision for reversal of losses 17  
Write-offs, net of recoveries, and other adjustments (15)  
Foreign exchange rate movements 0 (2)
Allowance account for credit losses of financial assets, ending balance 49 47
Total    
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Allowance account for credit losses of financial assets, beginning balance 117 75
Provision for (reversal of) losses 23 45
Write-offs, net of recoveries, and other adjustments (24)  
Foreign exchange rate movements (1) (3)
Allowance account for credit losses of financial assets, ending balance $ 115 $ 117