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Derivatives (Credit Exposure of Derivatives) (Details) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Classes Of Liabilities [Domain]    
Disclosure of financial assets [line items]    
Current replacement cost $ 23,450 $ 25,777
Credit equivalent amount 88,458 84,927
Risk-weighted amount 11,367 9,826
Classes Of Liabilities [Domain] | Interest rate contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 2,902 4,274
Credit equivalent amount 9,422 11,402
Risk-weighted amount 1,439 1,042
Classes Of Liabilities [Domain] | Foreign exchange contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 7,301 9,190
Credit equivalent amount 37,087 39,485
Risk-weighted amount 5,067 4,906
Classes Of Liabilities [Domain] | Other contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 1,475 1,784
Credit equivalent amount 17,500 14,923
Risk-weighted amount 4,064 3,226
Classes Of Liabilities [Domain] | Before master netting agreements [member]    
Disclosure of financial assets [line items]    
Current replacement cost 11,678 15,248
Credit equivalent amount 64,009 65,810
Risk-weighted amount 10,570 9,174
Classes Of Liabilities [Domain] | Derivatives qualifying central counterparty contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 11,772 10,529
Credit equivalent amount 24,449 19,117
Risk-weighted amount 797 652
Forward rate agreements [member] | Interest rate contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 49 35
Credit equivalent amount 162 102
Risk-weighted amount 61 29
Forward rate agreements [member] | Foreign exchange contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 1,064 1,746
Credit equivalent amount 5,180 5,643
Risk-weighted amount 978 1,022
Interest rate swap contract [member] | Interest rate contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 2,838 4,215
Credit equivalent amount 8,962 11,037
Risk-weighted amount 1,323 964
Interest rate swap contract [member] | Foreign exchange contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 2,802 3,234
Credit equivalent amount 16,099 16,136
Risk-weighted amount 2,373 2,246
Cross currency interest rate swap [member] | Foreign exchange contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 3,358 4,124
Credit equivalent amount 15,195 17,176
Risk-weighted amount 1,574 1,515
Options written [member] | Interest rate contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 5 7
Credit equivalent amount 147 140
Risk-weighted amount 26 26
Options written [member] | Foreign exchange contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 34 36
Credit equivalent amount 334 291
Risk-weighted amount 74 59
Options purchased [member] | Interest rate contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 10 17
Credit equivalent amount 151 123
Risk-weighted amount 29 23
Options purchased [member] | Foreign exchange contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 43 50
Credit equivalent amount 279 239
Risk-weighted amount 68 64
Credit contracts [member] | Other contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 0 0
Credit equivalent amount 192 207
Risk-weighted amount 26 30
Equity contracts [member] | Other contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 729 669
Credit equivalent amount 12,531 8,964
Risk-weighted amount 2,994 2,348
Commodity contracts [member] | Other contracts [member]    
Disclosure of financial assets [line items]    
Current replacement cost 746 1,115
Credit equivalent amount 4,777 5,752
Risk-weighted amount $ 1,044 $ 848