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Financial Instrument Risk Management - Changes in Allowances for Losses (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mortgages    
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Allowance account for credit losses of financial assets, beginning balance $ 22 $ 23
Provision for (reversal of) losses 3 0
Write-offs, net of recoveries, and other adjustments (2) 0
Foreign exchange rate movements 2 (1)
Allowance account for credit losses of financial assets, ending balance 25 22
Loans    
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Allowance account for credit losses of financial assets, beginning balance 28 7
Provision for (reversal of) losses 19 22
Write-offs, net of recoveries, and other adjustments 0 0
Foreign exchange rate movements 3 (1)
Allowance account for credit losses of financial assets, ending balance 50 28
Mortgages and loans    
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Allowance account for credit losses of financial assets, beginning balance 50 30
Provision for (reversal of) losses 22 22
Write-offs, net of recoveries, and other adjustments (2) 0
Foreign exchange rate movements 5 (2)
Allowance account for credit losses of financial assets, ending balance $ 75 $ 50