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Provisions, Contingent Liabilities, Commitments, Guarantees, Pledged Assets, and Collateral (Narrative) (Details Narrative)
$ in Millions
 3 Months Ended 12 Months Ended
Jul. 31, 2024
USD ($)
Apr. 30, 2024
CAD ($)
Oct. 31, 2025
CAD ($)
Oct. 31, 2025
USD ($)
Oct. 31, 2024
CAD ($)
Oct. 31, 2025
USD ($)
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Commitment to fund private equity investments     $ 617,000,000   $ 594,000,000  
Restructuring charges     686,000,000   566,000,000  
Securities And Exchange Commission And Commodity Futures Trading Commission [Member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Litigation settlement amount settled with counter party $ 124.5          
Civil Matter [Member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Litigation settlement amount settled with counter party   $ 274,000,000        
Department Of Justice, Criminal Division, Money Laundering And Asset Recovery Section And The United States Attorney's Office For The District Of New Jersey [Member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Litigation settlement amount settled with counter party     $ 4,233,000,000 $ 3,088.0    
Prohibition against average combined total assets of subsidiaries           $ 434,000.0
Percent of limit deduction, if subsidiary does not meet deadline     7.00%     7.00%
TDS-US, Deferred Prosecution Agreement [Member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Litigation settlement amount settled with counter party       15.5    
TDS-US, Deferred Prosecution Agreement [Member] | Securities and Exchange Commission [Member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Litigation settlement amount settled with counter party       7.0    
TDS-US, Deferred Prosecution Agreement [Member] | Financial Industry Regulatory Authority [Member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Litigation settlement amount settled with counter party       6.0    
Rotstain v Trustmark National Bank, et al. [Member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Amount on Ponzi scheme       7,200.0    
Litigation settlement amount settled with counter party       $ 1,205.0    
Litigation and other provision [member] | Bottom of range [member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Bank's reasonable possible losses     $ 0   0  
Litigation and other provision [member] | Top of range [member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Bank's reasonable possible losses     440,700,000   625,000,000  
Premises and equipment under long-term non-cancellable leases [member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Operating lease commitments annual payment     833,000,000   829,000,000  
Paid for short-term and low-value asset leases     7,000,000   $ 19,000,000  
Premises and equipment under long-term non-cancellable leases [member] | Over 4 years to 5 years [member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Future minimum operating lease commitments where annual rental is in excess of $100 thousand     482,000,000      
Premises and equipment under long-term non-cancellable leases [member] | Over 5 years [member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Future minimum operating lease commitments where annual rental is in excess of $100 thousand     5,490,000,000      
Premises and equipment under long-term non-cancellable leases [member] | Within 1 year [member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Future minimum operating lease commitments where annual rental is in excess of $100 thousand     31,000,000      
Premises and equipment under long-term non-cancellable leases [member] | Over 1 year to 2 years [member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Future minimum operating lease commitments where annual rental is in excess of $100 thousand     128,000,000      
Premises and equipment under long-term non-cancellable leases [member] | Over 2 years to 3 years [member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Future minimum operating lease commitments where annual rental is in excess of $100 thousand     186,000,000      
Premises and equipment under long-term non-cancellable leases [member] | Over 3 years to 4 years [member]            
Disclosure of Provisions Contingent Liabilities Commitments Guarantees Pledged Assets and Collateral [Line Items]            
Future minimum operating lease commitments where annual rental is in excess of $100 thousand     $ 359,000,000