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Financial Instruments - Risk Management - Summary of Cross Referencing of Internal Ratings to External Ratings (Detail) | 12 Months Ended
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Oct. 31, 2025 | [1]
Investment grade [member] | Equivalent external rating standard and poors AA to A plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 95 |
Investment grade [member] | Equivalent external rating standard and poors-A to-A minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 90 |
Investment grade [member] | Equivalent external rating standard and poors BBB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 87 |
Investment grade [member] | Equivalent external rating standard and poors BBB [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 85 |
Investment grade [member] | Equivalent external rating standard and poors BBB minus[member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 83 |
Non investment grade [member] | Equivalent external rating standard and poors BB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 80 |
Non investment grade [member] | Equivalent external rating standard and poors BB [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 77 |
Non investment grade [member] | Equivalent external rating standard and poors BB minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 75 |
Non investment grade [member] | Equivalent external rating standard and poors-B plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 73 |
Non investment grade [member] | Equivalent external rating standard and poors-B to-B minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 70 |
Watch list [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 30 |
Watch list [member] | Equivalent external rating standard and poors CCC plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 65 |
Watch list [member] | Equivalent external rating standard and poors CCC [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 60 |
Watch list [member] | Equivalent external rating standard and poors CCC- to CC [Member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 40 |
Default [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 21 |
Probability of default range percentage | 100.00% | [2]
Top of range [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 99 |
Probability of default range percentage | 0.0565% | [2]
Top of range [member] | Investment grade [member] | Equivalent external rating standard and poors AA to A plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.0693% | [2]
Top of range [member] | Investment grade [member] | Equivalent external rating standard and poors-A to-A minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.0833% | [2]
Top of range [member] | Investment grade [member] | Equivalent external rating standard and poors BBB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.1243% | [2]
Top of range [member] | Investment grade [member] | Equivalent external rating standard and poors BBB [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.1976% | [2]
Top of range [member] | Investment grade [member] | Equivalent external rating standard and poors BBB minus[member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.2743% | [2]
Top of range [member] | Non investment grade [member] | Equivalent external rating standard and poors BB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.3806% | [2]
Top of range [member] | Non investment grade [member] | Equivalent external rating standard and poors BB [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.7061% | [2]
Top of range [member] | Non investment grade [member] | Equivalent external rating standard and poors BB minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 1.429% | [2]
Top of range [member] | Non investment grade [member] | Equivalent external rating standard and poors-B plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 2.4715% | [2]
Top of range [member] | Non investment grade [member] | Equivalent external rating standard and poors-B to-B minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 6.2065% | [2]
Top of range [member] | Watch list [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 100.00% | [2]
Top of range [member] | Watch list [member] | Equivalent external rating standard and poors CCC plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 15.9382% | [2]
Top of range [member] | Watch list [member] | Equivalent external rating standard and poors CCC [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 28.5499% | [2]
Top of range [member] | Watch list [member] | Equivalent external rating standard and poors CCC- to CC [Member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 48.3748% | [2]
Bottom of range [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Internal grade rating | 98 |
Probability of default range percentage | 0.00% | [2]
Bottom of range [member] | Investment grade [member] | Equivalent external rating standard and poors AA to A plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.0565% | [2]
Bottom of range [member] | Investment grade [member] | Equivalent external rating standard and poors-A to-A minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.0693% | [2]
Bottom of range [member] | Investment grade [member] | Equivalent external rating standard and poors BBB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.0833% | [2]
Bottom of range [member] | Investment grade [member] | Equivalent external rating standard and poors BBB [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.1243% | [2]
Bottom of range [member] | Investment grade [member] | Equivalent external rating standard and poors BBB minus[member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.1976% | [2]
Bottom of range [member] | Non investment grade [member] | Equivalent external rating standard and poors BB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.2743% | [2]
Bottom of range [member] | Non investment grade [member] | Equivalent external rating standard and poors BB [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.3806% | [2]
Bottom of range [member] | Non investment grade [member] | Equivalent external rating standard and poors BB minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 0.7061% | [2]
Bottom of range [member] | Non investment grade [member] | Equivalent external rating standard and poors-B plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 1.429% | [2]
Bottom of range [member] | Non investment grade [member] | Equivalent external rating standard and poors-B to-B minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 2.4715% | [2]
Bottom of range [member] | Watch list [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 48.3748% | [2]
Bottom of range [member] | Watch list [member] | Equivalent external rating standard and poors CCC plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 6.2065% | [2]
Bottom of range [member] | Watch list [member] | Equivalent external rating standard and poors CCC [member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 15.9382% | [2]
Bottom of range [member] | Watch list [member] | Equivalent external rating standard and poors CCC- to CC [Member] |  |
Disclosure of internal credit grades [line items] |  |
Probability of default range percentage | 28.5499% | [2]
Equivalent external rating standard and poors default [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | AAA to AA+ |
Equivalent external rating standard and poors default [member] | Investment grade [member] | Equivalent external rating standard and poors AA to A plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | AA to A+ |
Equivalent external rating standard and poors default [member] | Investment grade [member] | Equivalent external rating standard and poors-A to-A minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | A to A- |
Equivalent external rating standard and poors default [member] | Investment grade [member] | Equivalent external rating standard and poors BBB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BBB+ |
Equivalent external rating standard and poors default [member] | Investment grade [member] | Equivalent external rating standard and poors BBB [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BBB |
Equivalent external rating standard and poors default [member] | Investment grade [member] | Equivalent external rating standard and poors BBB minus[member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BBB- |
Equivalent external rating standard and poors default [member] | Non investment grade [member] | Equivalent external rating standard and poors BB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BB+ |
Equivalent external rating standard and poors default [member] | Non investment grade [member] | Equivalent external rating standard and poors BB [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BB |
Equivalent external rating standard and poors default [member] | Non investment grade [member] | Equivalent external rating standard and poors BB minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BB- |
Equivalent external rating standard and poors default [member] | Non investment grade [member] | Equivalent external rating standard and poors-B plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | B+ |
Equivalent external rating standard and poors default [member] | Non investment grade [member] | Equivalent external rating standard and poors-B to-B minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | B to B- |
Equivalent external rating standard and poors default [member] | Watch list [member] | Equivalent external rating standard and poors CCC plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | CCC+ |
Equivalent external rating standard and poors default [member] | Watch list [member] | Equivalent external rating standard and poors CCC [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | CCC |
Equivalent external rating standard and poors default [member] | Watch list [member] | Equivalent external rating standard and poors CCC- to CC [Member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | CCC- to CC |
Equivalent external rating standard and poors default [member] | Default [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Default |
Equivalent external rating Moody's default [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Aaa to Aa1 |
Equivalent external rating Moody's default [member] | Investment grade [member] | Equivalent external rating standard and poors AA to A plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Aa2 to A1 |
Equivalent external rating Moody's default [member] | Investment grade [member] | Equivalent external rating standard and poors-A to-A minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | A2 to A3 |
Equivalent external rating Moody's default [member] | Investment grade [member] | Equivalent external rating standard and poors BBB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Baa1 |
Equivalent external rating Moody's default [member] | Investment grade [member] | Equivalent external rating standard and poors BBB [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Baa2 |
Equivalent external rating Moody's default [member] | Investment grade [member] | Equivalent external rating standard and poors BBB minus[member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Baa3 |
Equivalent external rating Moody's default [member] | Non investment grade [member] | Equivalent external rating standard and poors BB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Ba1 |
Equivalent external rating Moody's default [member] | Non investment grade [member] | Equivalent external rating standard and poors BB [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Ba2 |
Equivalent external rating Moody's default [member] | Non investment grade [member] | Equivalent external rating standard and poors BB minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Ba3 |
Equivalent external rating Moody's default [member] | Non investment grade [member] | Equivalent external rating standard and poors-B plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | B1 |
Equivalent external rating Moody's default [member] | Non investment grade [member] | Equivalent external rating standard and poors-B to-B minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | B2 to B3 |
Equivalent external rating Moody's default [member] | Watch list [member] | Equivalent external rating standard and poors CCC plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Caa1 |
Equivalent external rating Moody's default [member] | Watch list [member] | Equivalent external rating standard and poors CCC [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Caa2 |
Equivalent external rating Moody's default [member] | Watch list [member] | Equivalent external rating standard and poors CCC- to CC [Member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | Caa3 to Ca |
Equivalent external rating Dominion Bond Rating Service default [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | AAA to AA (high) |
Equivalent external rating Dominion Bond Rating Service default [member] | Investment grade [member] | Equivalent external rating standard and poors AA to A plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | AA to A (high) |
Equivalent external rating Dominion Bond Rating Service default [member] | Investment grade [member] | Equivalent external rating standard and poors-A to-A minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | A to A (low) |
Equivalent external rating Dominion Bond Rating Service default [member] | Investment grade [member] | Equivalent external rating standard and poors BBB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BBB (high) |
Equivalent external rating Dominion Bond Rating Service default [member] | Investment grade [member] | Equivalent external rating standard and poors BBB [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BBB |
Equivalent external rating Dominion Bond Rating Service default [member] | Investment grade [member] | Equivalent external rating standard and poors BBB minus[member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BBB (low) |
Equivalent external rating Dominion Bond Rating Service default [member] | Non investment grade [member] | Equivalent external rating standard and poors BB plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BB (high) |
Equivalent external rating Dominion Bond Rating Service default [member] | Non investment grade [member] | Equivalent external rating standard and poors BB [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BB |
Equivalent external rating Dominion Bond Rating Service default [member] | Non investment grade [member] | Equivalent external rating standard and poors BB minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | BB (low) |
Equivalent external rating Dominion Bond Rating Service default [member] | Non investment grade [member] | Equivalent external rating standard and poors-B plus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | B (high) |
Equivalent external rating Dominion Bond Rating Service default [member] | Non investment grade [member] | Equivalent external rating standard and poors-B to-B minus [member] |  |
Disclosure of internal credit grades [line items] |  |
Description of rating | B to B (low) |
[1] | Applies to non-retail portfolio.
[2] | PD Ranges as at October 31, 2025. The Range does not include the upper boundary for the row.

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