v3.22.2.2
Premises and Equipment - Summary of Premises and Equipment (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 7,424  
Ending balance 7,214 $ 7,424
Land [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 145  
Ending balance 141 145
Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 644  
Ending balance 634 644
Computer equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 542  
Ending balance 529 542
Furniture Fixtures and Other Equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 346  
Ending balance 311 346
Leasehold Improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,165  
Ending balance 1,189 1,165
Work In Progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 170  
Ending balance 120 170
Gross carrying amount [member] | Land [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 145 152
Additions   1
Disposals (10) (2)
Foreign exchange translation 7 (6)
Other (1)  
Ending balance 141 145
Gross carrying amount [member] | Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,308 1,310
Transfers from work in process 15 13
Disposals (83) (24)
Foreign exchange translation 24 (20)
Other (3) 29
Ending balance 1,261 1,308
Gross carrying amount [member] | Computer equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,126 1,150
Additions 24 28
Acquisitions through business combination 4  
Transfers from work in process 195 180
Disposals (195) (286)
Foreign exchange translation 17 (27)
Other (2) 81
Ending balance 1,169 1,126
Gross carrying amount [member] | Furniture Fixtures and Other Equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 773 886
Additions 3 6
Acquisitions through business combination 1  
Transfers from work in process 49 47
Disposals (5) (65)
Foreign exchange translation 15 (16)
Other   (85)
Ending balance 836 773
Gross carrying amount [member] | Leasehold Improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,754 2,675
Additions 28 94
Acquisitions through business combination 6  
Transfers from work in process 206 170
Disposals (205) (106)
Foreign exchange translation 67 (62)
Other (11) (17)
Ending balance 2,845 2,754
Gross carrying amount [member] | Work In Progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 170 203
Additions 397 388
Acquisitions through business combination 1  
Transfers from work in process (465) (410)
Disposals (1) (1)
Foreign exchange translation 6 (5)
Other 12 (5)
Ending balance 120 170
Accumulated depreciation and amortisation [member] | Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (664) (648)
Depreciation 48 49
Disposals 80 12
Foreign exchange translation 11 (9)
Other (16) (12)
Ending balance (627) (664)
Accumulated depreciation and amortisation [member] | Computer equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (584) (580)
Depreciation 234 245
Disposals 192 284
Foreign exchange translation 12 (16)
Other 2 59
Ending balance (640) (584)
Accumulated depreciation and amortisation [member] | Furniture Fixtures and Other Equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (427) (467)
Depreciation 94 94
Disposals 4 64
Foreign exchange translation 6 (7)
Other 2 (63)
Ending balance (525) (427)
Accumulated depreciation and amortisation [member] | Leasehold Improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,589) (1,480)
Depreciation 233 222
Disposals 204 92
Foreign exchange translation 38 (31)
Other   10
Ending balance (1,656) (1,589)
Right-of-use lease assets [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 7,424  
Ending balance 7,214 7,424
Right-of-use lease assets [Member] | Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 4,261  
Ending balance 4,105 4,261
Right-of-use lease assets [Member] | Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 151  
Ending balance 185 151
Right-of-use lease assets [Member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 11,978 11,801
Additions 860 1,005
Acquisitions through business combination 67  
Disposals (798) (589)
Foreign exchange translation 193 (302)
Other 119 63
Ending balance 12,419 11,978
Right-of-use lease assets [Member] | Gross carrying amount [member] | Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 5,394 5,171
Additions 270 379
Acquisitions through business combination 55  
Disposals (153) (49)
Foreign exchange translation 58 (167)
Other 124 60
Ending balance 5,748 5,394
Right-of-use lease assets [Member] | Gross carrying amount [member] | Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 308 254
Additions 138 109
Disposals (146) (56)
Foreign exchange translation (1) 1
Ending balance 299 308
Right-of-use lease assets [Member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (4,554) (3,867)
Depreciation 1,265 1,276
Disposals 732 497
Foreign exchange translation 68 (86)
Other 50 (6)
Ending balance (5,205) (4,554)
Right-of-use lease assets [Member] | Accumulated depreciation and amortisation [member] | Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,133) (584)
Depreciation 569 578
Disposals 106 5
Foreign exchange translation 2 (24)
Other 45  
Ending balance (1,643) (1,133)
Right-of-use lease assets [Member] | Accumulated depreciation and amortisation [member] | Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (157) (108)
Depreciation 87 88
Disposals 146 40
Foreign exchange translation (1) 1
Other 17  
Ending balance $ (114) $ (157)