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Financial Instrument Risk Management - Changes in Allowances for Losses (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in allowance for expected credit losses    
Beginning balance $ 162,948  
Ending balance 178,698 $ 162,948
Debt securities | Accumulated impairment    
Reconciliation of changes in allowance for expected credit losses    
Beginning balance 32 32
New originations or purchases 9 9
Derecognition or maturities (11) (6)
Net remeasurement (4) (3)
Ending balance 26 32
Debt securities | Financial instruments not credit-impaired | Accumulated impairment | 12-month expected credit losses    
Reconciliation of changes in allowance for expected credit losses    
Beginning balance 30 30
New originations or purchases 9 9
Derecognition or maturities (10) (6)
Net remeasurement (4) (3)
Ending balance 25 30
Debt securities | Financial instruments not credit-impaired | Accumulated impairment | Lifetime expected credit losses    
Reconciliation of changes in allowance for expected credit losses    
Beginning balance 2 2
New originations or purchases 0 0
Derecognition or maturities (1) 0
Net remeasurement 0 0
Ending balance 1 2
Debt securities | Financial instruments credit-impaired | Accumulated impairment | Lifetime expected credit losses    
Reconciliation of changes in allowance for expected credit losses    
Beginning balance 0 0
New originations or purchases 0 0
Derecognition or maturities 0 0
Net remeasurement 0 0
Ending balance 0 0
Total mortgages and loans    
Reconciliation of changes in allowance for expected credit losses    
Beginning balance 54,600  
Ending balance 57,619 54,600
Total mortgages and loans | Accumulated impairment    
Reconciliation of changes in allowance for expected credit losses    
Beginning balance 57 43
New originations or purchases 5 5
Derecognition or maturities (1) 0
Net remeasurement 6 9
Write-offs, net of recoveries, and other adjustments (5) 0
Ending balance 62 57
Total mortgages and loans | Financial instruments not credit-impaired | Accumulated impairment | 12-month expected credit losses    
Reconciliation of changes in allowance for expected credit losses    
Beginning balance 8 4
New originations or purchases 4 5
Derecognition or maturities (1) 0
Net remeasurement (5) (1)
Write-offs, net of recoveries, and other adjustments 0 0
Ending balance 6 8
Total mortgages and loans | Financial instruments not credit-impaired | Accumulated impairment | Lifetime expected credit losses    
Reconciliation of changes in allowance for expected credit losses    
Beginning balance 0 0
New originations or purchases 1 0
Derecognition or maturities 0 0
Net remeasurement 0 0
Write-offs, net of recoveries, and other adjustments 0 0
Ending balance 1 0
Total mortgages and loans | Financial instruments credit-impaired | Accumulated impairment | Lifetime expected credit losses    
Reconciliation of changes in allowance for expected credit losses    
Beginning balance 49 39
New originations or purchases 0 0
Derecognition or maturities 0 0
Net remeasurement 11 10
Write-offs, net of recoveries, and other adjustments (5) 0
Ending balance $ 55 $ 49