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Employee Benefits - Summary of Disaggregation of Defined Benefit Obligation (Detail) | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Pension plans [member] | Canada [member] |  |
Disclosure of defined benefit plans [line items] |  |
Active members | 51.00% | 51.00%
Inactive and retired members | 49.00% | 49.00%
Total | 100.00% | 100.00%
Pension plans [member] | Mexico [member] |  |
Disclosure of defined benefit plans [line items] |  |
Active members | 28.00% | 28.00%
Inactive and retired members | 72.00% | 72.00%
Total | 100.00% | 100.00%
Pension plans [member] | United States [member] |  |
Disclosure of defined benefit plans [line items] |  |
Active members | 28.00% | 31.00%
Inactive and retired members | 72.00% | 69.00%
Total | 100.00% | 100.00%
Other benefit plans [member] | Canada [member] |  |
Disclosure of defined benefit plans [line items] |  |
Active members | 3.00% | 3.00%
Inactive and retired members | 97.00% | 97.00%
Total | 100.00% | 100.00%
Other benefit plans [member] | Mexico [member] |  |
Disclosure of defined benefit plans [line items] |  |
Active members | 28.00% | 32.00%
Inactive and retired members | 72.00% | 68.00%
Total | 100.00% | 100.00%
Other benefit plans [member] | United States [member] |  |
Disclosure of defined benefit plans [line items] |  |
Active members | 32.00% | 43.00%
Inactive and retired members | 68.00% | 57.00%
Total | 100.00% | 100.00%

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- Definition Percentage of disaggregation of benefit obligation. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of disaggregation of benefit obligation active members. + References No definition available. + Details
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Namespace Prefix: | bns_
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- Definition Percentage of disaggregation of benefit obligation inactive and retired members. + References No definition available. + Details
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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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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=country_MX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=country_US
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Balance Type: |
Period Type: |

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- Details
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