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Structured Entities and Derecognition of Financial Assets - Schedule of Carrying Amount and Fair Value of Transferred Financial Assets that did not Qualify for Derecognition and Associated Financial Liabilities (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Carrying amount $ 142,094 $ 111,394
Associated liabilities, carrying amount 142,478 111,704
Fair value 142,152 111,380
Associated liabilities, fair value 142,443 111,655
Residential mortgage securitizations [member]    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Carrying amount 14,368 14,612
Fair value 14,426 14,598
Securities held by counterparties as collateral under repurchase agreements [member]    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Carrying amount 104,799 72,433
Fair value 104,799 72,433
Securities lent for cash collateral [member]    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Carrying amount 1,507 2,637
Fair value 1,507 2,637
Securities lent for securities collateral [member]    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Carrying amount 21,420 21,712
Fair value $ 21,420 $ 21,712