v3.22.2.2
Fair value of financial instrument - 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, 2022
Oct. 31, 2021
Disclosure of fair value measurement of assets and liabilities [line Items]    
Derivative assets $ 154,439 $ 95,541
Derivative liabilities 153,491 91,439
Recurring [member]    
Disclosure of fair value measurement of assets and liabilities [line Items]    
Derivative assets 154,439 95,541
Derivative liabilities 153,491 91,439
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 50 46
Net derivative balances, category [Member] | Level 3 [member] | Recurring [member]    
Disclosure of fair value measurement of assets and liabilities [line Items]    
Derivative assets 383 429
Derivative liabilities $ 2,106 $ 1,390