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Structured Entities and Derecognition of Financial Assets - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Credit card receivables | $ 21,581 | $ 20,551
Carrying amount of associated liabilities | 65,978 | 56,455
Assets that entity continues to recognize | 142,094 | 111,394
Consolidated structured entities amount of transferred assets at fair value | 142,152 | 111,380
Carrying amount of associated liabilities, fair value | 142,443 | 111,655
Assets | 1,116,938 | 1,041,985
Outstanding loans | 593,896 |
Securitisations [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Recognised assets representing continuing involvement in derecognised financial assets | 199 | 0
Gain (loss) of derecognised financial assets at date of transfer | 17 | 0
Financial assets at amortised cost, category [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Credit card receivables | 20,639 | 19,649
Single seller conduits [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Assets | 700 | 600
Multi seller conduits [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Assets | 22,800 | 16,900
Multi seller conduits [member] | Financial Assets Securities [Member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Financial assets recognised in entity's financial statements in relation to consolidated structured entities | 836 | 894
Multi seller conduits [member] | Financial Assets Securities [Member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Financial assets recognised in entity's financial statements in relation to consolidated structured entities | 392 | 84
Multi seller conduits [member] | Financial Assets Securities [Member] | Financial assets at amortised cost, category [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Financial assets recognised in entity's financial statements in relation to consolidated structured entities | 444 | 810
Multi seller conduits [member] | Loans Net of Allowance for Credit Losses [Member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Financial assets recognised in entity's financial statements in relation to consolidated structured entities | 1,224 | 677
CIBC managed investment funds [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Assets | 191,500 | 165,100
Community reinvestment act investments [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Assets | 11,200 | 10,100
Debt and equity investments held | 762 | 715
Credit card securitization trust [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Credit card receivables | 5,400 | 7,300
Other assets related to credit cards | 1,100 |
Credit card and other related receivables at fair value | 6,500 |
Credit card receivables fair value |  | 7,300
Credit card funding liabilities | 2,500 | 4,300
Credit card funding liabilities fair value | 2,500 | 4,400
Covered bond guarantor [member] | Legislative program [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Carrying amount of associated liabilities | 48,300 | 36,700
Carrying amount of associated liabilities, fair value | 48,500 | 36,800
Company managed investment funds [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Assets | 149 | 141
Non controlling interest | 69 | 44
Community based tax advantaged investments [member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Outstanding loans | 147 | 132
HELOCS Trust [Member] | Home Equity Line of Credit [Member] |  |
Disclosure of structured entities and derecognition of financial assets [line items] |  |
Assets that entity continues to recognize | 3,300 | 520
Consolidated structured entities amount of transferred assets at fair value | 3,300 | 520
Liabilities recognized in entitties financial statements in relation to structured entities | 500 | 500
Carrying amount of associated liabilities, fair value | $ 514 | $ 512

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