v3.24.3
Insurance and reinsurance - Summary of Insurance Contracts by Remaining Coverage and Incurred Claims (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Balance at beginning of period, Insurance contract assets $ 681 $ 487
Balance at beginning of period, Insurance contract liabilities (19,026) (18,226)
Balance at beginning of period, Net insurance contract liabilities (18,345) (17,739)
Insurance revenue 5,073 4,670
Insurance service expense (4,230) (3,749)
Insurance finance income (expense) (3,131) (421)
Cash flows:    
Premiums received (5,940) (5,739)
Claims and other insurance service expenses paid 4,388 4,196
Insurance acquisition cash flows and other 417 378
Total cash flows (1,135) (1,165)
Other movements 125 59
Balance at end of period, Insurance contract assets 588 681
Balance at end of period, Insurance contract liabilities (22,231) (19,026)
Balance at end of period, Net insurance contract liabilities (21,643) (18,345)
Liabilities for remaining coverage [member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Balance at beginning of period, Insurance contract assets 1,531 1,191
Balance at beginning of period, Insurance contract liabilities (17,858) (17,227)
Balance at beginning of period, Net insurance contract liabilities (16,327) (16,036)
Insurance revenue 5,073 4,670
Insurance service expense (358) (250)
Insurance finance income (expense) (2,974) (388)
Investment components 705 660
Cash flows:    
Premiums received (5,940) (5,739)
Insurance acquisition cash flows and other 417 378
Total cash flows (5,523) (5,361)
Other movements 343 378
Balance at end of period, Insurance contract assets 1,805 1,531
Balance at end of period, Insurance contract liabilities (20,866) (17,858)
Balance at end of period, Net insurance contract liabilities (19,061) (16,327)
Liabilities for incurred claims [member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Balance at beginning of period, Insurance contract assets (850) (704)
Balance at beginning of period, Insurance contract liabilities (1,168) (999)
Balance at beginning of period, Net insurance contract liabilities (2,018) (1,703)
Insurance service expense (3,872) (3,499)
Insurance finance income (expense) (157) (33)
Investment components (705) (660)
Cash flows:    
Claims and other insurance service expenses paid 4,388 4,196
Total cash flows 4,388 4,196
Other movements (218) (319)
Balance at end of period, Insurance contract assets (1,217) (850)
Balance at end of period, Insurance contract liabilities (1,365) (1,168)
Balance at end of period, Net insurance contract liabilities $ (2,582) $ (2,018)