v3.24.3
Goodwill and other intangible assets - Summary of Carrying Amount of Other Intangible Assets (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period $ 5,903  
Amortization charge for the year 1,549 $ 1,471
Impairment losses 68 108
Balance at end of period 7,798 5,903
Internally generated software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 1,999  
Balance at end of period 2,187 1,999
Other software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 439  
Balance at end of period 345 439
Core deposit intangibles [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 328  
Balance at end of period 1,974 328
Customer list and relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 1,610  
Balance at end of period 1,935 1,610
In process software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 1,527  
Balance at end of period 1,357 1,527
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 12,333 11,621
Additions 1,134 1,394
Acquisition through business combination 2,342 31
Dispositions (1,281) (806)
Impairment losses (85) (87)
Currency translations 174 295
Other changes (34) (115)
Balance at end of period 14,583 12,333
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 5,595 5,076
Additions 31 81
Transfers 1,204 1,067
Dispositions (1,204) (509)
Impairment losses (37) (73)
Currency translations 32 68
Other changes (47) (115)
Balance at end of period 5,574 5,595
Gross carrying amount [member] | Other software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period 1,097 908
Additions 4 179
Acquisition through business combination   31
Transfers 42 78
Dispositions (67) (145)
Impairment losses (18)  
Currency translations 17 17
Other changes (1) 29
Balance at end of period 1,074 1,097
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 1,658 1,630
Acquisition through business combination 1,972  
Currency translations 7 28
Balance at end of period 3,637 1,658
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 2,456 2,472
Additions 9  
Acquisition through business combination 370  
Dispositions (9) (160)
Impairment losses   (9)
Currency translations 115 144
Other changes   9
Balance at end of period 2,941 2,456
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 1,527 1,535
Additions 1,090 1,134
Transfers (1,246) (1,145)
Dispositions (1) 8
Impairment losses (30) (5)
Currency translations 3 38
Other changes 14 (38)
Balance at end of period 1,357 1,527
Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period (6,430) (5,538)
Amortization charge for the year (1,549) (1,471)
Dispositions 1,277 777
Impairment losses 17 (19)
Currency translations (67) (107)
Other changes (33) (72)
Balance at end of period (6,785) (6,430)
Accumulated amortization [member] | Internally generated software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period (3,596) (3,031)
Amortization charge for the year (986) (993)
Dispositions 1,204 506
Impairment losses 12 (19)
Currency translations (21) (37)
Other changes   (22)
Balance at end of period (3,387) (3,596)
Accumulated amortization [member] | Other software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period (658) (612)
Amortization charge for the year (102) (146)
Dispositions 66 157
Impairment losses 5  
Currency translations (7) (13)
Other changes (33) (44)
Balance at end of period (729) (658)
Accumulated amortization [member] | Core deposit intangibles [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of period (1,330) (1,146)
Amortization charge for the year (325) (160)
Currency translations (8) (24)
Balance at end of period (1,663) (1,330)
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 (846) (749)
Amortization charge for the year (136) (172)
Dispositions 7 114
Currency translations (31) (33)
Other changes   (6)
Balance at end of period $ (1,006) $ (846)