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Loans and Allowance for Credit Losses - Summary of Continuity in Loss Allowance by Each Product Type (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of credit risk exposure [line items]    
Beginning balance $ 4,936  
Ending balance 5,739 $ 4,936
IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 4,936  
Ending balance 5,739 4,936
IFRS9 [member] | Allowance for credit losses related to loans [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 4,356  
Ending balance 5,050 4,356
IFRS9 [member] | Allowance for credit losses related to other credit instruments [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 580  
Ending balance 689 580
Residential mortgages [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 261 234
Net remeasurement of loss allowance 73 64
Loan originations 23 24
Derecognitions and maturities (21) (16)
Model changes (23) (6)
Total PCL 52 66
Write-offs (10) (5)
Recoveries of previous write-offs 9 7
Foreign exchange and other (65) (41)
Ending balance 247 261
Consumer installment and other personal loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 843 806
Net remeasurement of loss allowance 587 555
Loan originations 32 54
Derecognitions and maturities (59) (66)
Model changes 123 61
Total PCL 683 604
Write-offs (692) (623)
Recoveries of previous write-offs 151 195
Foreign exchange and other (70) (139)
Ending balance 915 843
Credit Card Loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 705 496
Net remeasurement of loss allowance 750 759
Loan originations 52 76
Derecognitions and maturities (63) (35)
Model changes 133 13
Total PCL 872 813
Write-offs (903) (720)
Recoveries of previous write-offs 209 171
Foreign exchange and other (92) (55)
Ending balance 791 705
Business and government loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 3,127 2,731
Net remeasurement of loss allowance 2,223 2,338
Loan originations 285 286
Derecognitions and maturities (548) (466)
Model changes 51 110
Total PCL 2,011 2,268
Write-offs (1,367) (1,802)
Recoveries of previous write-offs 314 194
Foreign exchange and other (299) (264)
Ending balance 3,786 3,127
Stage One [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 1,378  
Ending balance 1,375 1,378
Stage One [member] | IFRS9 [member] | Allowance for credit losses related to loans [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 1,143  
Ending balance 1,119 1,143
Stage One [member] | IFRS9 [member] | Allowance for credit losses related to other credit instruments [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 235  
Ending balance 256 235
Stage One [member] | Residential mortgages [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 56 73
Transfer to Stage 1 151 132
Transfer to Stage 2 (15) (26)
Transfer to Stage 3   (1)
Net remeasurement of loss allowance (135) (142)
Loan originations 23 24
Derecognitions and maturities (5) (3)
Model changes (20) (1)
Total PCL (1) (17)
Foreign exchange and other 1  
Ending balance 56 56
Stage One [member] | Consumer installment and other personal loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 197 220
Transfer to Stage 1 331 301
Transfer to Stage 2 (62) (44)
Transfer to Stage 3 (7) (7)
Net remeasurement of loss allowance (317) (237)
Loan originations 32 54
Derecognitions and maturities (19) (16)
Model changes 46 15
Total PCL 4 66
Foreign exchange and other (1) (89)
Ending balance 200 197
Stage One [member] | Credit Card Loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 233 188
Transfer to Stage 1 239 226
Transfer to Stage 2 (115) (64)
Transfer to Stage 3 (9) (6)
Net remeasurement of loss allowance (194) (182)
Loan originations 52 76
Derecognitions and maturities (13) (8)
Model changes (2) 4
Total PCL (42) 46
Foreign exchange and other (3) (1)
Ending balance 188 233
Stage One [member] | Business and government loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 892 1,043
Transfer to Stage 1 553 601
Transfer to Stage 2 (254) (278)
Transfer to Stage 3 (8) (9)
Net remeasurement of loss allowance (419) (599)
Loan originations 285 278
Derecognitions and maturities (146) (147)
Model changes 24 53
Total PCL 35 (101)
Foreign exchange and other 4 (50)
Ending balance 931 892
Stage Two [Member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 2,827  
Ending balance 3,334 2,827
Stage Two [Member] | IFRS9 [member] | Allowance for credit losses related to loans [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 2,560  
Ending balance 2,957 2,560
Stage Two [Member] | IFRS9 [member] | Allowance for credit losses related to other credit instruments [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 267  
Ending balance 377 267
Stage Two [Member] | Residential mortgages [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 186 151
Transfer to Stage 1 (148) (130)
Transfer to Stage 2 50 42
Transfer to Stage 3 (44) (29)
Net remeasurement of loss allowance 154 170
Derecognitions and maturities (16) (13)
Model changes (3) (5)
Total PCL (7) 35
Ending balance 179 186
Stage Two [Member] | Consumer installment and other personal loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 471 434
Transfer to Stage 1 (310) (283)
Transfer to Stage 2 114 91
Transfer to Stage 3 (177) (133)
Net remeasurement of loss allowance 421 355
Derecognitions and maturities (40) (38)
Model changes 77 46
Total PCL 85 38
Foreign exchange and other (1) (1)
Ending balance 555 471
Stage Two [Member] | Credit Card Loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 472 308
Transfer to Stage 1 (239) (226)
Transfer to Stage 2 116 64
Transfer to Stage 3 (453) (290)
Net remeasurement of loss allowance 633 633
Derecognitions and maturities (50) (27)
Model changes 135 9
Total PCL 142 163
Foreign exchange and other (11) 1
Ending balance 603 472
Stage Two [Member] | Business and government loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 1,698 1,155
Transfer to Stage 1 (510) (575)
Transfer to Stage 2 362 394
Transfer to Stage 3 (388) (310)
Net remeasurement of loss allowance 1,166 1,189
Loan originations   8
Derecognitions and maturities (402) (308)
Model changes 27 57
Total PCL 255 455
Foreign exchange and other 44 88
Ending balance 1,997 1,698
Stage three [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 731  
Ending balance 1,030 731
Stage three [member] | IFRS9 [member] | Allowance for credit losses related to loans [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 653  
Ending balance 974 653
Stage three [member] | IFRS9 [member] | Allowance for credit losses related to other credit instruments [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 78  
Ending balance 56 78
Stage three [member] | Residential mortgages [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 19 10
Transfer to Stage 1 (3) (2)
Transfer to Stage 2 (35) (16)
Transfer to Stage 3 44 30
Net remeasurement of loss allowance 54 36
Total PCL 60 48
Write-offs (10) (5)
Recoveries of previous write-offs 9 7
Foreign exchange and other (66) (41)
Ending balance 12 19
Stage three [member] | Consumer installment and other personal loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 175 152
Transfer to Stage 1 (21) (18)
Transfer to Stage 2 (52) (47)
Transfer to Stage 3 184 140
Net remeasurement of loss allowance 483 437
Derecognitions and maturities   (12)
Total PCL 594 500
Write-offs (692) (623)
Recoveries of previous write-offs 151 195
Foreign exchange and other (68) (49)
Ending balance 160 175
Stage three [member] | Credit Card Loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Transfer to Stage 2 (1)  
Transfer to Stage 3 462 296
Net remeasurement of loss allowance 311 308
Total PCL 772 604
Write-offs (903) (720)
Recoveries of previous write-offs 209 171
Foreign exchange and other (78) (55)
Stage three [member] | Business and government loans [member] | IFRS9 [member]    
Disclosure of credit risk exposure [line items]    
Beginning balance 537 533
Transfer to Stage 1 (43) (26)
Transfer to Stage 2 (108) (116)
Transfer to Stage 3 396 319
Net remeasurement of loss allowance 1,476 1,748
Derecognitions and maturities   (11)
Total PCL 1,721 1,914
Write-offs (1,367) (1,802)
Recoveries of previous write-offs 314 194
Foreign exchange and other (347) (302)
Ending balance $ 858 $ 537