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Loans, Impaired Loans, and Allowance for Credit Losses (Summary of Allowance for Loan Losses) (Details) - CAD ($)
$ in Millions
12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period $ 9,137  
Balance at beginning of period 8,094  
Total Allowance, including off-balance sheet instruments, at end of period 9,741 $ 9,137
Less: Total Allowance for off-balance sheet instruments 1,052 1,043
Total Allowance for Loan Losses at end of period 8,689 8,094
Residential mortgages [member]    
IFRS Statement [Line Items]    
Balance at beginning of period 365 403
Net remeasurement due to transfers into stage (9) (8)
New originations or purchases 25 32
Net repayments (8) (4)
Derecognition of financial assets (excluding disposals and write-offs) (62) (69)
Changes to risk, parameters, and models 49 15
Disposals 0 0
Write-offs (11) (8)
Recoveries 7 1
Foreign exchange and other adjustments 1 3
Total Allowance for Loan Losses at end of period 357 365
Residential mortgages [member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Residential mortgages [member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Residential mortgages [member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Consumer instalment and other personal [Member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 2,133 1,895
Balance at beginning of period 2,049  
Net remeasurement due to transfers into stage (6) 42
New originations or purchases 345 359
Net repayments (211) (187)
Derecognition of financial assets (excluding disposals and write-offs) (251) (228)
Changes to risk, parameters, and models 1,508 1,421
Disposals 0 0
Write-offs (1,597) (1,496)
Recoveries 347 323
Foreign exchange and other adjustments 5 4
Total Allowance, including off-balance sheet instruments, at end of period 2,273 2,133
Less: Total Allowance for off-balance sheet instruments 80 84
Total Allowance for Loan Losses at end of period 2,193 2,049
Consumer instalment and other personal [Member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Consumer instalment and other personal [Member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Consumer instalment and other personal [Member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Credit Card 1 [Member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 2,699 2,577
Balance at beginning of period 2,097  
Net remeasurement due to transfers into stage (16) 26
New originations or purchases 160 153
Net repayments 77 101
Derecognition of financial assets (excluding disposals and write-offs) (467) (493)
Changes to risk, parameters, and models 2,009 1,889
Disposals 0 0
Write-offs 2,078 1,880
Recoveries 393 319
Foreign exchange and other adjustments 13 7
Total Allowance, including off-balance sheet instruments, at end of period 2,790 2,699
Less: Total Allowance for off-balance sheet instruments 498 602
Total Allowance for Loan Losses at end of period 2,292 2,097
Credit Card 1 [Member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Credit Card 1 [Member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Credit Card 1 [Member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Business and government [member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 3,940 3,310
Balance at beginning of period 3,583  
Net remeasurement due to transfers into stage 93 85
New originations or purchases 1,458 1,165
Net repayments (240) (117)
Derecognition of financial assets (excluding disposals and write-offs) (2,112) (1,591)
Changes to risk, parameters, and models 2,163 1,662
Disposals (22) (39)
Write-offs (1,039) (600)
Recoveries 85 64
Foreign exchange and other adjustments (5) 1
Total Allowance, including off-balance sheet instruments, at end of period 4,321 3,940
Less: Total Allowance for off-balance sheet instruments 474 357
Total Allowance for Loan Losses at end of period 3,847 3,583
Business and government [member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Business and government [member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Business and government [member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Stage 1 [member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 2,909  
Balance at beginning of period 2,470  
Total Allowance, including off-balance sheet instruments, at end of period 3,209 2,909
Less: Total Allowance for off-balance sheet instruments 470 439
Total Allowance for Loan Losses at end of period 2,739 2,470
Stage 1 [member] | Residential mortgages [member]    
IFRS Statement [Line Items]    
Balance at beginning of period 116 154
Net remeasurement due to transfers into stage (24) (30)
New originations or purchases 25 32
Net repayments (4) (4)
Derecognition of financial assets (excluding disposals and write-offs) (14) (7)
Changes to risk, parameters, and models (80) (135)
Disposals 0 0
Write-offs 0 0
Recoveries 0 0
Foreign exchange and other adjustments 1 (1)
Total Allowance for Loan Losses at end of period 102 116
Stage 1 [member] | Residential mortgages [member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage 108 137
Stage 1 [member] | Residential mortgages [member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage (26) (30)
Stage 1 [member] | Residential mortgages [member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage 0 0
Stage 1 [member] | Consumer instalment and other personal [Member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 696 688
Balance at beginning of period 667  
Net remeasurement due to transfers into stage (297) (267)
New originations or purchases 345 359
Net repayments (87) (76)
Derecognition of financial assets (excluding disposals and write-offs) (87) (74)
Changes to risk, parameters, and models (295) (286)
Disposals 0 0
Write-offs 0 0
Recoveries 0 0
Foreign exchange and other adjustments 2 2
Total Allowance, including off-balance sheet instruments, at end of period 724 696
Less: Total Allowance for off-balance sheet instruments 25 29
Total Allowance for Loan Losses at end of period 699 667
Stage 1 [member] | Consumer instalment and other personal [Member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage 696 607
Stage 1 [member] | Consumer instalment and other personal [Member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage (239) (246)
Stage 1 [member] | Consumer instalment and other personal [Member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage (10) (11)
Stage 1 [member] | Credit Card 1 [Member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 947 988
Balance at beginning of period 704  
Net remeasurement due to transfers into stage (503) (476)
New originations or purchases 160 153
Net repayments (5) 25
Derecognition of financial assets (excluding disposals and write-offs) (60) (55)
Changes to risk, parameters, and models (521) (432)
Disposals 0 0
Write-offs 0 0
Recoveries 0 0
Foreign exchange and other adjustments 4 1
Total Allowance, including off-balance sheet instruments, at end of period 944 947
Less: Total Allowance for off-balance sheet instruments 201 243
Total Allowance for Loan Losses at end of period 743 704
Stage 1 [member] | Credit Card 1 [Member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage 1,299 1,087
Stage 1 [member] | Credit Card 1 [Member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage (352) (323)
Stage 1 [member] | Credit Card 1 [Member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage (25) (21)
Stage 1 [member] | Business and government [member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 1,150 1,319
Balance at beginning of period 983  
Net remeasurement due to transfers into stage (103) (86)
New originations or purchases 1,458 1,165
Net repayments 13 20
Derecognition of financial assets (excluding disposals and write-offs) (804) (683)
Changes to risk, parameters, and models 82 (271)
Disposals 0 0
Write-offs 0 0
Recoveries 0 0
Foreign exchange and other adjustments 24 7
Total Allowance, including off-balance sheet instruments, at end of period 1,439 1,150
Less: Total Allowance for off-balance sheet instruments 244 167
Total Allowance for Loan Losses at end of period 1,195 983
Stage 1 [member] | Business and government [member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage 356 266
Stage 1 [member] | Business and government [member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage (727) (568)
Stage 1 [member] | Business and government [member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage (10) (19)
Stage 2 [member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 4,675  
Balance at beginning of period 4,082  
Total Allowance, including off-balance sheet instruments, at end of period 4,928 4,675
Less: Total Allowance for off-balance sheet instruments 566 593
Total Allowance for Loan Losses at end of period 4,362 4,082
Stage 2 [member] | Residential mortgages [member]    
IFRS Statement [Line Items]    
Balance at beginning of period 189 192
Net remeasurement due to transfers into stage 15 22
Net repayments (4) 0
Derecognition of financial assets (excluding disposals and write-offs) (20) (27)
Changes to risk, parameters, and models 84 114
Disposals 0 0
Write-offs 0 0
Recoveries 0 0
Foreign exchange and other adjustments 0 1
Total Allowance for Loan Losses at end of period 175 189
Stage 2 [member] | Residential mortgages [member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage (103) (133)
Stage 2 [member] | Residential mortgages [member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage 56 52
Stage 2 [member] | Residential mortgages [member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage (42) (32)
Stage 2 [member] | Consumer instalment and other personal [Member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 1,175 1,010
Balance at beginning of period 1,120  
Net remeasurement due to transfers into stage 282 300
Net repayments (107) (95)
Derecognition of financial assets (excluding disposals and write-offs) (115) (104)
Changes to risk, parameters, and models 698 590
Disposals 0 0
Write-offs 0 0
Recoveries 0 0
Foreign exchange and other adjustments 2 2
Total Allowance, including off-balance sheet instruments, at end of period 1,275 1,175
Less: Total Allowance for off-balance sheet instruments 55 55
Total Allowance for Loan Losses at end of period 1,220 1,120
Stage 2 [member] | Consumer instalment and other personal [Member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage (691) (603)
Stage 2 [member] | Consumer instalment and other personal [Member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage 329 329
Stage 2 [member] | Consumer instalment and other personal [Member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage (298) (254)
Stage 2 [member] | Credit Card 1 [Member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 1,374 1,277
Balance at beginning of period 1,015  
Net remeasurement due to transfers into stage 461 477
Net repayments 8 11
Derecognition of financial assets (excluding disposals and write-offs) (97) (71)
Changes to risk, parameters, and models 1,495 1,204
Disposals 0 0
Write-offs 0 0
Recoveries 0 0
Foreign exchange and other adjustments 8 4
Total Allowance, including off-balance sheet instruments, at end of period 1,386 1,374
Less: Total Allowance for off-balance sheet instruments 297 359
Total Allowance for Loan Losses at end of period 1,089 1,015
Stage 2 [member] | Credit Card 1 [Member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage (1,257) (1,051)
Stage 2 [member] | Credit Card 1 [Member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage 441 404
Stage 2 [member] | Credit Card 1 [Member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage (1,047) (881)
Stage 2 [member] | Business and government [member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 1,937 1,521
Balance at beginning of period 1,758  
Net remeasurement due to transfers into stage 193 158
Net repayments (44) (60)
Derecognition of financial assets (excluding disposals and write-offs) (940) (611)
Changes to risk, parameters, and models 998 917
Disposals 0 0
Write-offs 0 0
Recoveries 0 0
Foreign exchange and other adjustments 16 43
Total Allowance, including off-balance sheet instruments, at end of period 2,092 1,937
Less: Total Allowance for off-balance sheet instruments 214 179
Total Allowance for Loan Losses at end of period 1,878 1,758
Stage 2 [member] | Business and government [member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage (352) (265)
Stage 2 [member] | Business and government [member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage 766 584
Stage 2 [member] | Business and government [member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage (482) (350)
Stage 3 [member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 1,553  
Balance at beginning of period 1,542  
Total Allowance, including off-balance sheet instruments, at end of period 1,604 1,553
Less: Total Allowance for off-balance sheet instruments 16 11
Total Allowance for Loan Losses at end of period 1,588 1,542
Stage 3 [member] | Residential mortgages [member]    
IFRS Statement [Line Items]    
Balance at beginning of period 60 57
Net remeasurement due to transfers into stage 0 0
Net repayments 0 0
Derecognition of financial assets (excluding disposals and write-offs) (28) (35)
Changes to risk, parameters, and models 45 36
Disposals 0 0
Write-offs (11) (8)
Recoveries 7 1
Foreign exchange and other adjustments 0 3
Total Allowance for Loan Losses at end of period 80 60
Stage 3 [member] | Residential mortgages [member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage (5) (4)
Stage 3 [member] | Residential mortgages [member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage (30) (22)
Stage 3 [member] | Residential mortgages [member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage 42 32
Stage 3 [member] | Consumer instalment and other personal [Member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 262 197
Balance at beginning of period 262  
Net remeasurement due to transfers into stage 9 9
Net repayments (17) (16)
Derecognition of financial assets (excluding disposals and write-offs) (49) (50)
Changes to risk, parameters, and models 1,105 1,117
Disposals 0 0
Write-offs (1,597) (1,496)
Recoveries 347 323
Foreign exchange and other adjustments 1 0
Total Allowance, including off-balance sheet instruments, at end of period 274 262
Less: Total Allowance for off-balance sheet instruments 0 0
Total Allowance for Loan Losses at end of period 274 262
Stage 3 [member] | Consumer instalment and other personal [Member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage (5) (4)
Stage 3 [member] | Consumer instalment and other personal [Member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage (90) (83)
Stage 3 [member] | Consumer instalment and other personal [Member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage 308 265
Stage 3 [member] | Credit Card 1 [Member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 378 312
Balance at beginning of period 378  
Net remeasurement due to transfers into stage 26 25
Net repayments 74 65
Derecognition of financial assets (excluding disposals and write-offs) (310) (367)
Changes to risk, parameters, and models 1,035 1,117
Disposals 0 0
Write-offs 2,078 1,880
Recoveries 393 319
Foreign exchange and other adjustments 1 2
Total Allowance, including off-balance sheet instruments, at end of period 460 378
Less: Total Allowance for off-balance sheet instruments 0 0
Total Allowance for Loan Losses at end of period 460 378
Stage 3 [member] | Credit Card 1 [Member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage (42) (36)
Stage 3 [member] | Credit Card 1 [Member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage (89) (81)
Stage 3 [member] | Credit Card 1 [Member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage 1,072 902
Stage 3 [member] | Business and government [member]    
IFRS Statement [Line Items]    
Balance, including off-balance sheet instruments, at beginning of period 853 470
Balance at beginning of period 842  
Net remeasurement due to transfers into stage 3 13
Net repayments (209) (77)
Derecognition of financial assets (excluding disposals and write-offs) (368) (297)
Changes to risk, parameters, and models 1,083 1,016
Disposals (22) (39)
Write-offs (1,039) (600)
Recoveries 85 64
Foreign exchange and other adjustments (45) (49)
Total Allowance, including off-balance sheet instruments, at end of period 790 853
Less: Total Allowance for off-balance sheet instruments 16 11
Total Allowance for Loan Losses at end of period 774 842
Stage 3 [member] | Business and government [member] | Transfer to stage one [member]    
IFRS Statement [Line Items]    
Transfer to Stage (4) (1)
Stage 3 [member] | Business and government [member] | Transfer to stage two [member]    
IFRS Statement [Line Items]    
Transfer to Stage (39) (16)
Stage 3 [member] | Business and government [member] | Transfer to stage three [member]    
IFRS Statement [Line Items]    
Transfer to Stage $ 492 $ 369