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Goodwill and Other Intangibles (Summary of Other Intangibles) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year $ 3,044  
Amortization charge for the year 780 $ 702
Balance at end of year 3,409 3,044
Core deposit intangibles [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 0  
Balance at end of year 0 0
Credit card related intangibles [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 55  
Balance at end of year 44 55
Internally generated software [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 2,411  
Balance at end of year 2,907 2,411
Other software [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 60  
Balance at end of year 68 60
Other intangible [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 518  
Balance at end of year 390 518
Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 8,768 8,457
Additions 1,165 993
Disposals (5) (17)
Fully amortized intangibles (4,330) (687)
Foreign currency translation adjustments and other 10 22
Balance at end of year 5,608 8,768
Gross carrying amount [member] | Core deposit intangibles [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 2,720 2,712
Additions 0 0
Disposals 0 0
Fully amortized intangibles (2,741) 0
Foreign currency translation adjustments and other 21 8
Balance at end of year 0 2,720
Gross carrying amount [member] | Credit card related intangibles [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 851 850
Additions 0 0
Disposals 0 0
Fully amortized intangibles (734) 0
Foreign currency translation adjustments and other 1 1
Balance at end of year 118 851
Gross carrying amount [member] | Internally generated software [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 3,407 3,103
Additions 1,095 961
Disposals (3) (5)
Fully amortized intangibles (300) (627)
Foreign currency translation adjustments and other (4) (25)
Balance at end of year 4,195 3,407
Gross carrying amount [member] | Other software [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 195 236
Additions 70 23
Disposals (7) (6)
Fully amortized intangibles (46) (60)
Foreign currency translation adjustments and other 1 2
Balance at end of year 213 195
Gross carrying amount [member] | Other intangible [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 1,595 1,556
Additions 0 9
Disposals 5 (6)
Fully amortized intangibles (509) 0
Foreign currency translation adjustments and other (9) 36
Balance at end of year 1,082 1,595
Accumulated depreciation and impairment/losses [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 5,724 5,686
Disposals (10) (3)
Impairment losses (reversals) 0 0
Amortization charge for the year 780 702
Fully amortized intangibles (4,330) (687)
Foreign currency translation adjustments and other 35 26
Balance at end of year 2,199 5,724
Accumulated depreciation and impairment/losses [member] | Core deposit intangibles [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 2,720 2,712
Disposals 0 0
Impairment losses (reversals) 0 0
Amortization charge for the year 0 0
Fully amortized intangibles (2,741) 0
Foreign currency translation adjustments and other 21 8
Balance at end of year 0 2,720
Accumulated depreciation and impairment/losses [member] | Credit card related intangibles [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 796 785
Disposals 0 0
Impairment losses (reversals) 0 0
Amortization charge for the year 11 11
Fully amortized intangibles (734) 0
Foreign currency translation adjustments and other 1 0
Balance at end of year 74 796
Accumulated depreciation and impairment/losses [member] | Internally generated software [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 996 1,127
Disposals (7) 0
Impairment losses (reversals) 0 0
Amortization charge for the year 586 498
Fully amortized intangibles (300) (627)
Foreign currency translation adjustments and other 13 (2)
Balance at end of year 1,288 996
Accumulated depreciation and impairment/losses [member] | Other software [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 135 163
Disposals (3) (3)
Impairment losses (reversals) 0 0
Amortization charge for the year 58 32
Fully amortized intangibles (46) (60)
Foreign currency translation adjustments and other 1 3
Balance at end of year 145 135
Accumulated depreciation and impairment/losses [member] | Other intangible [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at beginning of year 1,077 899
Disposals 0 0
Impairment losses (reversals) 0 0
Amortization charge for the year 125 161
Fully amortized intangibles (509) 0
Foreign currency translation adjustments and other (1) 17
Balance at end of year $ 692 $ 1,077