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Operating and Geographic Segmentation - Summary of Average Assets, Grouped by Operating Segment (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of operating segments [line items]    
Net interest income $ 21,487 $ 19,468
Non-interest revenue 14,787 13,327
Total Revenue 36,274 32,795
Total provision (recovery of) for credit losses 3,617 3,761
Depreciation and amortization 2,180 2,110
Non-interest expense 18,927 17,389
Income (loss) before taxes and non-controlling interest in subsidiaries 11,550 9,535
Provision for (recovery of) income taxes 2,825 2,208
Reported net income (loss) 8,725 7,327
Non-controlling interest in subsidiaries 16 9
Net income (loss) attributable to bank shareholders 8,709 7,318
Average assets 1,480,561 1,369,415
Impaired Loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 3,147 3,066
Performing loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 470 695
Canadian P&C [member]    
Disclosure of operating segments [line items]    
Net interest income 9,667 8,852
Non-interest revenue 2,595 2,587
Total Revenue 12,262 11,439
Total provision (recovery of) for credit losses 2,364 1,659
Depreciation and amortization 644 590
Non-interest expense 4,716 4,415
Income (loss) before taxes and non-controlling interest in subsidiaries 4,538 4,775
Provision for (recovery of) income taxes 1,243 1,318
Reported net income (loss) 3,295 3,457
Net income (loss) attributable to bank shareholders 3,295 3,457
Average assets 344,176 327,883
Canadian P&C [member] | Impaired Loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 1,952 1,326
Canadian P&C [member] | Performing loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 412 333
U.S. Banking [member]    
Disclosure of operating segments [line items]    
Net interest income 9,017 8,602
Non-interest revenue 2,466 2,209
Total Revenue 11,483 10,811
Total provision (recovery of) for credit losses 1,043 1,677
Depreciation and amortization 990 1,006
Non-interest expense 5,865 5,684
Income (loss) before taxes and non-controlling interest in subsidiaries 3,585 2,444
Provision for (recovery of) income taxes 775 434
Reported net income (loss) 2,810 2,010
Non-controlling interest in subsidiaries 14 2
Net income (loss) attributable to bank shareholders 2,796 2,008
Average assets 257,177 251,881
U.S. Banking [member] | Impaired Loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 1,010 1,285
U.S. Banking [member] | Performing loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 33 392
Wealth Management [member]    
Disclosure of operating segments [line items]    
Net interest income 1,020 873
Non-interest revenue 4,282 3,726
Total Revenue 5,302 4,599
Total provision (recovery of) for credit losses 10 17
Depreciation and amortization 215 215
Non-interest expense 3,245 2,961
Income (loss) before taxes and non-controlling interest in subsidiaries 1,832 1,406
Provision for (recovery of) income taxes 451 339
Reported net income (loss) 1,381 1,067
Net income (loss) attributable to bank shareholders 1,381 1,067
Average assets 53,224 49,134
Wealth Management [member] | Impaired Loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 8 15
Wealth Management [member] | Performing loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 2 2
Capital Markets [member]    
Disclosure of operating segments [line items]    
Net interest income 2,482 1,731
Non-interest revenue 4,965 4,785
Total Revenue 7,447 6,516
Total provision (recovery of) for credit losses 201 369
Depreciation and amortization 331 299
Non-interest expense 4,285 3,979
Income (loss) before taxes and non-controlling interest in subsidiaries 2,630 1,869
Provision for (recovery of) income taxes 653 377
Reported net income (loss) 1,977 1,492
Net income (loss) attributable to bank shareholders 1,977 1,492
Average assets 551,491 468,963
Capital Markets [member] | Impaired Loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 133 367
Capital Markets [member] | Performing loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 68 2
Corporate services [member]    
Disclosure of operating segments [line items]    
Net interest income (699) (590)
Non-interest revenue 479 20
Total Revenue (220) (570)
Total provision (recovery of) for credit losses (1) 39
Non-interest expense 816 350
Income (loss) before taxes and non-controlling interest in subsidiaries (1,035) (959)
Provision for (recovery of) income taxes (297) (260)
Reported net income (loss) (738) (699)
Non-controlling interest in subsidiaries 2 7
Net income (loss) attributable to bank shareholders (740) (706)
Average assets 274,493 271,554
Corporate services [member] | Impaired Loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses 44 73
Corporate services [member] | Performing loans [member]    
Disclosure of operating segments [line items]    
Total provision (recovery of) for credit losses $ (45) $ (34)