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Securities - Summary of Securities (Detail) - CAD ($) $ in Millions | Jul. 31, 2025 | Oct. 31, 2024
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Disclosure of detailed information about financial instruments [abstract] |  |  |
Securities measured and designated at FVOCI |  | $ 84,093 | $ 76,693
Securities measured at amortized cost | [1] | 68,812 | 71,610
Securities mandatorily measured and designated at FVTPL |  | 122,092 | 106,042
Total financial securities |  | $ 274,997 | $ 254,345
[1] | There were no sales of securities measured at amortized cost during the quarter (October 31, 2024: a realized gain of nil).

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