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Post-Employment Benefits - Summary of Expected Future Benefit Payments (Detail) - Canada plan [member] $ in Millions | Oct. 31, 2025 CAD ($)
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Disclosure of defined benefit plans [line items] |
2026 | $ 401
2027 | 414
2028 | 429
2029 | 445
2030 | 461
2031–2035 | 2,516
Total | 4,666
Pension plan [member] |
Disclosure of defined benefit plans [line items] |
2026 | 375
2027 | 387
2028 | 402
2029 | 417
2030 | 433
2031–2035 | 2,374
Total | 4,388
Other post employment benefit plans [member] |
Disclosure of defined benefit plans [line items] |
2026 | 26
2027 | 27
2028 | 27
2029 | 28
2030 | 28
2031–2035 | 142
Total | $ 278

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- Definition Defined benefit plan expected future benefit payments in year five. + References No definition available. + Details
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Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
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- Definition Defined benefit plan expected future benefit payments year four. + References No definition available. + Details
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Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
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- Definition Defined benefit plan expected future benefit payment year six to ten. + References No definition available. + Details
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Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
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- Definition Defined benefit plan expected future benefit payments year three + References No definition available. + Details
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- Definition Defined benefit plan expected future benefit payments year two. + References No definition available. + Details
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- Definition Defined benefit plan expected future benefit payments + References No definition available. + Details
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- Definition Defined benefit plan expected future benefit payments next twelve months. + References No definition available. + Details
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Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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