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Financial Instrument Risk Management - Changes in Allowances for Losses (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt securities    
Reconciliation of changes in allowance for expected credit losses    
Balance, beginning of year   $ 32
Transfers between stages $ 0  
New originations or purchases 9  
Derecognition or maturities (6)  
Net remeasurement (3)  
Write-offs, net of recoveries, and other adjustments 0  
Balance, end of year 32  
Debt securities | Performing - Stage 1    
Reconciliation of changes in allowance for expected credit losses    
Balance, beginning of year   30
Transfers between stages 0  
New originations or purchases 9  
Derecognition or maturities (6)  
Net remeasurement (3)  
Write-offs, net of recoveries, and other adjustments 0  
Balance, end of year 30  
Debt securities | Performing - Stage 2    
Reconciliation of changes in allowance for expected credit losses    
Balance, beginning of year   2
Transfers between stages 0  
New originations or purchases 0  
Derecognition or maturities 0  
Net remeasurement 0  
Write-offs, net of recoveries, and other adjustments 0  
Balance, end of year 2  
Debt securities | Impaired - Stage 3    
Reconciliation of changes in allowance for expected credit losses    
Balance, beginning of year   0
Transfers between stages 0  
New originations or purchases 0  
Derecognition or maturities 0  
Net remeasurement 0  
Write-offs, net of recoveries, and other adjustments 0  
Balance, end of year 0  
Total mortgages and loans    
Reconciliation of changes in allowance for expected credit losses    
Balance, beginning of year   43
Transfers between stages 0  
New originations or purchases 5  
Derecognition or maturities 0  
Net remeasurement 9  
Write-offs, net of recoveries, and other adjustments 0  
Balance, end of year 57  
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Allowance account for credit losses of financial assets, beginning balance 192 132
Provision for (reversal of) losses   55
Foreign exchange rate movements   5
Allowance account for credit losses of financial assets, ending balance   192
Total mortgages and loans | Performing - Stage 1    
Reconciliation of changes in allowance for expected credit losses    
Balance, beginning of year   4
Transfers between stages 0  
New originations or purchases 5  
Derecognition or maturities 0  
Net remeasurement (1)  
Write-offs, net of recoveries, and other adjustments 0  
Balance, end of year 8  
Total mortgages and loans | Performing - Stage 2    
Reconciliation of changes in allowance for expected credit losses    
Balance, beginning of year   0
Transfers between stages 0  
New originations or purchases 0  
Derecognition or maturities 0  
Net remeasurement 0  
Write-offs, net of recoveries, and other adjustments 0  
Balance, end of year 0  
Total mortgages and loans | Impaired - Stage 3    
Reconciliation of changes in allowance for expected credit losses    
Balance, beginning of year   39
Transfers between stages 0  
New originations or purchases 0  
Derecognition or maturities 0  
Net remeasurement 10  
Write-offs, net of recoveries, and other adjustments 0  
Balance, end of year 49  
Mortgages    
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Allowance account for credit losses of financial assets, beginning balance 80 80
Provision for (reversal of) losses   (2)
Foreign exchange rate movements   2
Allowance account for credit losses of financial assets, ending balance   80
Loans    
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Allowance account for credit losses of financial assets, beginning balance $ 112 52
Provision for (reversal of) losses   57
Foreign exchange rate movements   3
Allowance account for credit losses of financial assets, ending balance   $ 112