v3.24.3
Fair value of financial instruments - Changes in Fair Value Measurement for Instruments Measured on a Recurring Basis and Categorized in Level 3 (Parenthetical) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Disclosure of fair value measurement of assets and liabilities [line Items]    
Derivative assets $ 150,612 $ 142,450
Derivative liabilities 163,763 142,629
Recurring [member]    
Disclosure of fair value measurement of assets and liabilities [line Items]    
Derivative assets 150,612 142,450
Derivative liabilities 163,763 142,629
Investment [member] | Level 3 [member] | Recurring [member]    
Disclosure of fair value measurement of assets and liabilities [line Items]    
Unrealized gains (losses), excluding foreign currency translation, recognized in OCI 38 65
Net derivative balances, category [Member] | Level 3 [member] | Recurring [member]    
Disclosure of fair value measurement of assets and liabilities [line Items]    
Derivative assets 392 409
Derivative liabilities $ 1,221 $ 1,555