v3.26.1
Securities - Summary of Amortized Cost Securities (Details) - CAD ($)
$ in Millions
Apr. 30, 2026
Oct. 31, 2025
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost $ 91,678 $ 96,610
Canadian federal government    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 810 949
Canadian provincial and municipal governments    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 7,055 6,182
U.S. federal government    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 41,234 43,468
U.S. states, municipalities and agencies    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 145 165
Other governments    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 451 525
NHA MBS, U.S. agency MBS and CMO    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 35,154 37,770
Corporate debt    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 6,829 7,551
Fair value    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 86,022 90,448
Fair value | Canadian federal government    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 810 943
Fair value | Canadian provincial and municipal governments    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 7,108 6,220
Fair value | U.S. federal government    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 38,671 40,432
Fair value | U.S. states, municipalities and agencies    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 145 167
Fair value | Other governments    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 451 523
Fair value | NHA MBS, U.S. agency MBS and CMO    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost 32,217 34,838
Fair value | Corporate debt    
Disclosure of Detailed Information About Amortized Cost Securities [Line Items]    
Debt securities at amortized cost $ 6,620 $ 7,325