v3.22.2.2
IFRS 7 Disclosure - Market Risk - Summary of Market Risk VaR and Market Risk SVaR (Detail) - CAD ($)
$ in Millions
Oct. 31, 2022
Oct. 31, 2021
Equity [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR $ 45 $ 24
Foreign exchange [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 3 4
Commodities [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 6 3
Interest rate [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 47 61
Credit specific [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 5 9
Diversification [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR (47) (51)
Market Risk [Member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 59 50
Market risk Stressed VaR 192 59
Weighted average [member] | Equity [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 34 20
Weighted average [member] | Foreign exchange [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 4 4
Weighted average [member] | Commodities [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 5 3
Weighted average [member] | Interest rate [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 34 44
Weighted average [member] | Credit specific [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 7 8
Weighted average [member] | Diversification [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR (31) (35)
Weighted average [member] | Market Risk [Member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 53 44
Market risk Stressed VaR 103 53
Top of range [member] | Equity [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 51 38
Top of range [member] | Foreign exchange [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 7 6
Top of range [member] | Commodities [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 6 4
Top of range [member] | Interest rate [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 62 64
Top of range [member] | Credit specific [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 10 11
Top of range [member] | Market Risk [Member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 87 72
Market risk Stressed VaR 226 101
Bottom of range [member] | Equity [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 21 12
Bottom of range [member] | Foreign exchange [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 1 2
Bottom of range [member] | Commodities [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 3 2
Bottom of range [member] | Interest rate [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 17 21
Bottom of range [member] | Credit specific [member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 4 6
Bottom of range [member] | Market Risk [Member]    
Disclosure of Market Risk VAR [Line Items]    
Market risk VaR 34 23
Market risk Stressed VaR $ 47 $ 29