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Property and Equipment - Summary of Property and Equipment (Detail)
$ in Millions
 12 Months Ended
Oct. 31, 2025
CAD ($)
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year $ 3,359
Balance at end of year 3,443
Gross carrying amount [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 7,477
Additions 684
Disposals (495)
Adjustments 13
Balance at end of year 7,679
Accumulated depreciation [Member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year (4,118)
Depreciation and impairment 518
Disposals 406
Adjustments 6
Balance at end of year (4,236)
Right-of-use assets [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 1,643
Balance at end of year 1,583
Right-of-use assets [member] | Gross carrying amount [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 2,933
Additions 236
Disposals (120)
Adjustments 5
Balance at end of year 3,054
Right-of-use assets [member] | Accumulated depreciation [Member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year (1,290)
Depreciation and impairment 269
Disposals 90
Adjustments 2
Balance at end of year (1,471)
Land and buildings [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 472
Balance at end of year 492
Land and buildings [member] | Gross carrying amount [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 831
Additions 46
Disposals (14)
Adjustments 1
Balance at end of year 864
Land and buildings [member] | Accumulated depreciation [Member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year (359)
Depreciation and impairment 19
Disposals 7
Adjustments 1
Balance at end of year (372)
Computer equipment [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 190
Balance at end of year 173
Computer equipment [member] | Gross carrying amount [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 1,087
Additions 68
Disposals (231)
Adjustments 2
Balance at end of year 926
Computer equipment [member] | Accumulated depreciation [Member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year (897)
Depreciation and impairment 85
Disposals 230
Adjustments 1
Balance at end of year (753)
Office furniture, equipment and other [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 409
Balance at end of year 437
Office furniture, equipment and other [member] | Gross carrying amount [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 956
Additions 134
Disposals (83)
Adjustments 3
Balance at end of year 1,010
Office furniture, equipment and other [member] | Accumulated depreciation [Member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year (547)
Depreciation and impairment 60
Disposals 35
Adjustments 1
Balance at end of year (573)
Leasehold improvements [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 645
Balance at end of year 758
Leasehold improvements [member] | Gross carrying amount [member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year 1,670
Additions 200
Disposals (47)
Adjustments 2
Balance at end of year 1,825
Leasehold improvements [member] | Accumulated depreciation [Member]  
Disclosure of Detailed Information About Land and Buildings [Line items]  
Balance at beginning of year (1,025)
Depreciation and impairment 85
Disposals 44
Adjustments 1
Balance at end of year $ (1,067)