Investments in Equity-Accounted Associates and Joint Ventures - Additional Information (Detail) - CAD ($) $ in Millions	12 Months Ended
Oct. 31, 2023	Oct. 31, 2022
Disclosure Of Joint Ventures And Associates [Line Items]
Cumulative unrecognised share of losses of joint ventures	$ 0
Unrecognised share of losses of joint ventures	0
Investments in associates	137	$ 206
Unrecognized share of losses of associate	0
Cumulative unrecognized share of losses of associate	0
Top of range [member]
Disclosure Of Joint Ventures And Associates [Line Items]
Investment commitment in associates	0	0
Listed associates [Member] \| At Carrying Value [Member]
Disclosure Of Joint Ventures And Associates [Line Items]
Investments in associates	0	33
Listed associates [Member] \| At fair value [member]
Disclosure Of Joint Ventures And Associates [Line Items]
Investments in associates, fair value where price quotations published	0	33
Unlisted Associates [member] \| At Carrying Value [Member]
Disclosure Of Joint Ventures And Associates [Line Items]
Investments in associates	137	173
Unlisted Associates [member] \| At fair value [member]
Disclosure Of Joint Ventures And Associates [Line Items]
Investments in associates, fair value where price quotations not published	240	197
Associates [member]
Disclosure Of Joint Ventures And Associates [Line Items]
Undrawn credit commitments	1	1
Loans	$ 0	0
Joint ventures [member]
Disclosure Of Joint Ventures And Associates [Line Items]
Description of joint venture	CIBC is a 50/50 joint venture partner with The Bank of New York Mellon in two joint ventures: CIBC Mellon Trust Company and CIBC Mellon Global Securities Services Company
Country of incorporation of joint venture	Canada
Proportion of ownership interest in joint venture	50.00%
Loans	$ 0	0
Undrawn credit commitments	131	130
Canadian Personal and Business Banking [member]
Disclosure Of Joint Ventures And Associates [Line Items]
Investments in associates	19	18
Canadian Commercial Banking and Wealth Management [member]
Disclosure Of Joint Ventures And Associates [Line Items]
Investments in associates	33	33
U.S. Commercial Banking and Wealth Management [member]
Disclosure Of Joint Ventures And Associates [Line Items]
Investments in associates	0	7
Capital Markets and Direct Financial Services [member]
Disclosure Of Joint Ventures And Associates [Line Items]
Investments in associates	42	109
Corporate and Other [member]
Disclosure Of Joint Ventures And Associates [Line Items]
Investment in joint venture	532	426
Investments in associates	$ 43	$ 39

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Investment commitment in associates.

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The amount of loans the entity has made to its associates.

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The country in which a joint venture of the entity is incorporated. [Refer: Joint ventures [member]]

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The cumulative amount of the unrecognised share of losses of associates if the entity has stopped recognising its share of losses when applying the equity method. [Refer: Associates [member]; Unrecognised share of losses of associates]

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The cumulative amount of the unrecognised share of losses of joint ventures if the entity has stopped recognising its share of losses when applying the equity method. [Refer: Joint ventures [member]; Unrecognised share of losses of joint ventures]

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The description of the nature of the entity's relationship with a joint venture (for example, describing the nature of the activities of the joint venture and whether they are strategic to the entity's activities). [Refer: Joint ventures [member]]

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The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Associates [member]; Investments in associates reported in separate financial statements]

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The amount of investments in associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method]

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The amount of investments in joint ventures accounted for using the equity method. [Refer: Joint ventures [member]; Investments accounted for using equity method]

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The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

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The amount of the unrecognised share of associates' losses if the entity has stopped recognising its share of losses when applying the equity method. [Refer: Associates [member]]

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The amount of the unrecognised share of joint ventures' losses if the entity has stopped recognising its share of losses when applying the equity method. [Refer: Joint ventures [member]]

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