v3.26.1
Fair Value of Financial Instruments - Summary of Changes in Level 3 Instruments Carried at Fair Value (Detail) - Level 3 [member] - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2026
Apr. 30, 2025
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance $ 2,208   $ 2,211  
Gains/(losses) recorded in income [1] 53   74  
Gains/(losses) recorded in OCI 26   24  
Purchases/ Issuances 82   313  
Sales/ Settlements (230)   (501)  
Fair value, ending balance 2,088   2,088  
Change in unrealized gains/(losses)recorded in income for instruments still held [2] 53   89  
Transfers into Level 3 10   43  
Transfers out of Level 3 (61)   (76)  
Derivative financial instruments [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance   $ 20   $ 10
Gains/(losses) recorded in income [1]   (15)   (12)
Purchases/ Issuances       4
Sales/ Settlements   8   8
Transfers into Level 3   (15)   (15)
Transfers out of Level 3   (6)   (3)
Fair value, ending balance   (8)   (8)
Derivative financial liabilities [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 67   120  
Gains/(losses) recorded in income [1] (3)   (3)  
Purchases/ Issuances 2   (3)  
Sales/ Settlements 1   (70)  
Fair value, ending balance 6   6  
Change in unrealized gains/(losses)recorded in income for instruments still held [2] (3)   11  
Transfers into Level 3     31  
Transfers out of Level 3 (61)   (69)  
Obligations related to securities sold short [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance       (2)
Transfers out of Level 3       2
Trading assets [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 172 10 13 25
Gains/(losses) recorded in income [1] (17)   (18) 1
Gains/(losses) recorded in OCI     (3)  
Purchases/ Issuances 1 3 169 4
Sales/ Settlements (3) (2) (3) (15)
Fair value, ending balance 163   163  
Change in unrealized gains/(losses)recorded in income for instruments still held [2] (17)   (17)  
Transfers into Level 3 10 6 12 13
Transfers out of Level 3   (8) (7) (19)
Fair value, ending balance   9   9
Trading assets [member] | Equity securities [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 11   12  
Gains/(losses) recorded in income [1]     (1)  
Purchases/ Issuances     4  
Sales/ Settlements (3)   (3)  
Fair value, ending balance 17   17  
Transfers into Level 3 9   11  
Transfers out of Level 3     (6)  
Trading assets [member] | Trading loans [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 161   1  
Gains/(losses) recorded in income [1] (17)   (17)  
Gains/(losses) recorded in OCI     (3)  
Purchases/ Issuances 1   165  
Fair value, ending balance 146   146  
Change in unrealized gains/(losses)recorded in income for instruments still held [2] (17)   (17)  
Transfers into Level 3 1   1  
Transfers out of Level 3     (1)  
Investment securities [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 1,969 2,012 2,078 1,901
Gains/(losses) recorded in income [1] 73 13 95 64
Gains/(losses) recorded in OCI 26 54 27 59
Purchases/ Issuances 79 29 147 100
Sales/ Settlements (228) (111) (428) (119)
Fair value, ending balance 1,919   1,919  
Change in unrealized gains/(losses)recorded in income for instruments still held [2] 73   95  
Transfers out of Level 3   (9)   (17)
Fair value, ending balance   $ 1,988   $ 1,988
Investment securities [member] | Equity securities [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 1,938   2,046  
Gains/(losses) recorded in income [1] 73   95  
Gains/(losses) recorded in OCI 27   29  
Purchases/ Issuances 78   146  
Sales/ Settlements (206)   (406)  
Fair value, ending balance 1,910   1,910  
Change in unrealized gains/(losses)recorded in income for instruments still held [2] 73   95  
Investment securities [member] | Corporate and Other Debt [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 31   32  
Gains/(losses) recorded in OCI (1)   (2)  
Purchases/ Issuances 1   1  
Sales/ Settlements (22)   (22)  
Fair value, ending balance 9   9  
Derivative financial assets [member] | Interest rate contracts [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance     3  
Gains/(losses) recorded in income [1]     (1)  
Sales/ Settlements     (2)  
Change in unrealized gains/(losses)recorded in income for instruments still held [2],[3]     (1)  
Derivative financial assets [member] | Equity contracts [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 93   161  
Gains/(losses) recorded in income [1] (1)   (10)  
Purchases/ Issuances 2   7  
Sales/ Settlements     (70)  
Fair value, ending balance 29   29  
Change in unrealized gains/(losses)recorded in income for instruments still held [2],[4] (1)   10  
Transfers into Level 3     31  
Transfers out of Level 3 (65)   (90)  
Derivative financial assets [member] | Commodity Contracts [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 10   16  
Gains/(losses) recorded in income [1] (3)   (9)  
Fair value, ending balance 7   7  
Change in unrealized gains/(losses)recorded in income for instruments still held [2] (3)   (9)  
Derivative financial assets [member] | Credit Contracts [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 6   4  
Gains/(losses) recorded in income [1]     2  
Purchases/ Issuances 3   3  
Fair value, ending balance 9   9  
Change in unrealized gains/(losses)recorded in income for instruments still held [2]     2  
Derivative financial assets [member] | Foreign exchange and gold contracts [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance 1   1  
Gains/(losses) recorded in income [1] (1)      
Fair value, ending balance 1   1  
Change in unrealized gains/(losses)recorded in income for instruments still held [2] (1)      
Transfers into Level 3 1   1  
Transfers out of Level 3     (1)  
Interest rate contracts [member] | Derivative financial liabilities [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance (3)   (8)  
Gains/(losses) recorded in income [1]     4  
Purchases/ Issuances     (1)  
Sales/ Settlements     1  
Fair value, ending balance (1)   (1)  
Change in unrealized gains/(losses)recorded in income for instruments still held [2],[3]     (2)  
Transfers into Level 3 (1)   (1)  
Transfers out of Level 3 3   4  
Equity contracts [member] | Derivative financial liabilities [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance (28)   (43)  
Gains/(losses) recorded in income [1] 2   9  
Purchases/ Issuances (3)   (12)  
Fair value, ending balance (28)   (28)  
Change in unrealized gains/(losses)recorded in income for instruments still held [2],[4] 2   9  
Transfers out of Level 3 1   18  
Credit Contracts [member] | Derivative financial liabilities [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance (2)   (2)  
Fair value, ending balance (2)   (2)  
Commodity Contracts [member] | Derivative financial liabilities [member]        
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]        
Fair value, beginning balance (10)   (12)  
Gains/(losses) recorded in income [1]     2  
Sales/ Settlements 1   1  
Fair value, ending balance $ (9)   (9)  
Change in unrealized gains/(losses)recorded in income for instruments still held [2]     $ 2  
[1] Gains or losses for items in Level 3 may be offset with losses or gains on related hedges in Level 1 or Level 2.
[2] These amounts represent the gains and losses from fair value changes of Level 3 instruments still held at the end of the period that are recorded in the Consolidated Statement of Income.
[3] Certain unrealized gains and losses on interest rate derivative contracts are largely offset by mark-to-market changes on embedded derivatives on certain deposit liabilities in the Consolidated Statement of Income.
[4] Certain unrealized gains and losses on derivative assets and liabilities are largely offset by mark-to-market changes on other instruments included in trading revenues in the Consolidated Statement of Income, since these instruments act as an economic hedge to certain derivative assets and liabilities.