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Insurance (Summary of Components of Insurance Service Result) (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2024
Apr. 30, 2023
Disclosure Of Amounts Arising From Insurance Contracts [Line Items]        
Insurance revenue $ 1,665 $ 1,514 $ 3,341 $ 3,056
Insurance service expenses 1,248 1,118 2,614 2,282
Insurance service result before reinsurance contracts held 417 396 727 774
Net (income) expense from reinsurance contracts held (31) (38) (19) (84)
Insurance service result $ 386 $ 358 $ 708 $ 690