v3.22.2.2
Goodwill and other intangible assets - Summary of Carrying Amount of Other Intangible Assets (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period $ 4,471  
Amortization charge for the year 1,369 $ 1,287
Impairment losses 18 29
Balance at end of period 6,083 4,471
Internally generated software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 1,907  
Balance at end of period 2,045 1,907
Other software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 322  
Balance at end of period 296 322
Core deposit intangibles [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 589  
Balance at end of period 484 589
Customer list and relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 417  
Balance at end of period 1,723 417
In process software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 1,236  
Balance at end of period 1,535 1,236
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 9,904 9,672
Additions 1,297 1,192
Acquisition through business combination 1,454  
Dispositions (1,405) (495)
Impairment losses (27) (166)
Currency translations 411 (308)
Other changes (13) 9
Balance at end of period 11,621 9,904
Gross carrying amount [member] | Internally generated software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 4,886 4,321
Additions 25 48
Transfers 1,121 1,022
Dispositions (960) (258)
Impairment losses (16) (157)
Currency translations 71 (83)
Other changes (51) (7)
Balance at end of period 5,076 4,886
Gross carrying amount [member] | Other software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 894 1,031
Additions 16 15
Acquisition through business combination 14  
Transfers 76 69
Dispositions (111) (186)
Currency translations 48 (43)
Other changes (29) 8
Balance at end of period 908 894
Gross carrying amount [member] | Core deposit intangibles [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 1,474 1,586
Currency translations 149 (112)
Other changes 7  
Balance at end of period 1,630 1,474
Gross carrying amount [member] | Customer list and relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 1,414 1,493
Acquisition through business combination 1,292  
Dispositions (329) (43)
Currency translations 113 (41)
Other changes (18) 5
Balance at end of period 2,472 1,414
Gross carrying amount [member] | In process software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 1,236 1,241
Additions 1,256 1,129
Acquisition through business combination 148  
Transfers (1,197) (1,091)
Dispositions (5) (8)
Impairment losses (11) (9)
Currency translations 30 (29)
Other changes 78 3
Balance at end of period 1,535 1,236
Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period (5,433) (4,920)
Amortization charge for the year (1,369) (1,287)
Dispositions 1,383 485
Impairment losses 9 137
Currency translations (152) 156
Other changes 24 (4)
Balance at end of period (5,538) (5,433)
Accumulated amortization [member] | Internally generated software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period (2,979) (2,529)
Amortization charge for the year (976) (898)
Dispositions 959 257
Impairment losses 9 137
Currency translations (36) 45
Other changes (8) 9
Balance at end of period (3,031) (2,979)
Accumulated amortization [member] | Other software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period (572) (630)
Amortization charge for the year (137) (138)
Dispositions 109 185
Currency translations (31) 24
Other changes 19 (13)
Balance at end of period (612) (572)
Accumulated amortization [member] | Core deposit intangibles [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period (885) (793)
Amortization charge for the year (153) (150)
Currency translations (98) 58
Other changes (10)  
Balance at end of period (1,146) (885)
Accumulated amortization [member] | Customer list and relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period (997) (968)
Amortization charge for the year (103) (101)
Dispositions 315 43
Currency translations 13 29
Other changes 23  
Balance at end of period $ (749) $ (997)