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Derivatives (Summary of Fair Value of Derivatives) (Details) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets $ 82,972 $ 78,061
Derivative financial liabilities 79,356 68,368
Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 68,190 67,971
Derivative financial liabilities 72,553 63,053
Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 14,782 10,090
Derivative financial liabilities 6,803 5,315
Interest rate contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 9,324 13,413
Derivative financial liabilities 7,646 10,636
Interest rate contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 1,680 2,029
Derivative financial liabilities 2,008 2,808
Interest rate contracts [member] | Forward rate agreements [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 119 232
Interest rate contracts [member] | Forward rate agreements [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 0 8
Interest rate contracts [member] | Swaps [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 7,968 11,971
Interest rate contracts [member] | Swaps [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 1,680 2,005
Interest rate contracts [member] | Options written [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 0 0
Interest rate contracts [member] | Options written [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 0 0
Interest rate contracts [member] | Options purchased [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 1,237 1,210
Interest rate contracts [member] | Options purchased [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 0 16
Foreign exchange contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 43,718 43,946
Derivative financial liabilities 40,733 39,940
Foreign exchange contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 9,891 7,115
Derivative financial liabilities 1,792 1,038
Foreign exchange contracts [member] | Forward rate agreements [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 3,585 3,617
Foreign exchange contracts [member] | Forward rate agreements [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 35 386
Foreign exchange contracts [member] | Swaps [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 14,776 15,456
Foreign exchange contracts [member] | Swaps [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 29 80
Foreign exchange contracts [member] | Cross currency interest rate swap [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 24,854 24,366
Foreign exchange contracts [member] | Cross currency interest rate swap [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 9,827 6,649
Foreign exchange contracts [member] | Options written [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 0 0
Foreign exchange contracts [member] | Options purchased [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 503 507
Credit contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 44 5
Derivative financial liabilities 312 296
Credit contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 0 1
Derivative financial liabilities 128 107
Credit contracts [member] | Credit default swap contacts protection purchased [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 12 0
Credit contracts [member] | Credit default swap contacts protection purchased [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 0 1
Credit contracts [member] | Credit default swap contacts protection sold [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 32 5
Other contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 15,104 10,607
Derivative financial liabilities 23,862 12,181
Other contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 3,211 945
Derivative financial liabilities 2,875 1,362
Other contracts [member] | Equity contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 9,485 5,286
Other contracts [member] | Equity contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 3,211 945
Other contracts [member] | Commodity derivatives [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial assets 5,619 5,321
Forward rate agreements [member] | Interest rate contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 93 48
Forward rate agreements [member] | Interest rate contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 0 0
Forward rate agreements [member] | Foreign exchange contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 1,935 2,521
Forward rate agreements [member] | Foreign exchange contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 1,129 494
Interest rate swap contract [member] | Interest rate contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 6,432 9,470
Interest rate swap contract [member] | Interest rate contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 2,006 2,807
Interest rate swap contract [member] | Foreign exchange contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 14,845 14,304
Interest rate swap contract [member] | Foreign exchange contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 1 20
Options written [member] | Interest rate contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 1,121 1,118
Options written [member] | Interest rate contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 0 1
Options written [member] | Foreign exchange contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 575 619
Options purchased [member] | Interest rate contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 0 0
Options purchased [member] | Interest rate contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 2 0
Options purchased [member] | Foreign exchange contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 0 0
Cross currency interest rate swap [member] | Foreign exchange contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 23,378 22,496
Cross currency interest rate swap [member] | Foreign exchange contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 662 524
Credit default swaps-protection purchased [member] | Credit contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 311 294
Credit default swaps-protection purchased [member] | Credit contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 128 107
Credit default swap-protection sold [member] | Credit contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 1 2
Equity contracts [member] | Other contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 16,808 6,636
Equity contracts [member] | Other contracts [member] | Non trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities 2,875 1,362
Commodity derivatives [member] | Other contracts [member] | Trading derivatives [member]    
Disclosure Of Derivative Financial Instruments [Line Items]    
Derivative financial liabilities $ 7,054 $ 5,545