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Derivatives (Narrative) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Derivative Financial Instruments [Line Items]    
Interest income $ 87,621 $ 93,389
Material Reconciliation [Member]    
Derivative Financial Instruments [Line Items]    
Interest income 205 242
Master derivative agreements - credit support provisions [member]    
Derivative Financial Instruments [Line Items]    
Fair value of derivative instruments with credit risk related contingent features in a net liability position 17,000 16,000
Banks collateral for normal course of business 18,000 17,000
Master derivative agreement - net liability position [member]    
Derivative Financial Instruments [Line Items]    
Posting of collateral or other acceptable remedy 331 511
Funding totaling 358 134
One-notch downgrade credit rating [member] | Master derivative agreements - credit support provisions [member]    
Derivative Financial Instruments [Line Items]    
Additional banks collateral for normal course of business 1,015 49
Two-notch downgrade credit rating [member] | Master derivative agreements - credit support provisions [member]    
Derivative Financial Instruments [Line Items]    
Additional banks collateral for normal course of business $ 1,536 $ 1,228