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Significant Subsidiaries - Summary List of Significant Subsidiaries (Detail)
$ in Millions
 12 Months Ended
Oct. 31, 2025
CAD ($)
CIBC Asset Management Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Asset Management Inc.
Address of head or principal office Toronto, Ontario, Canada
Book value of shares owned by CIBC $ 444
CIBC BA Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC BA Limited
Address of head or principal office Toronto, Ontario, Canada
CIBC Bancorp USA Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Bancorp USA Inc.
Address of head or principal office Chicago, Illinois, U.S.
Book value of shares owned by CIBC $ 10,595
Canadian Imperial Holdings Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name Canadian Imperial Holdings Inc.
Address of head or principal office New York, New York, U.S.
CIBC Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Inc.
Address of head or principal office New York, New York, U.S.
CIBC World Markets Corp. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC World Markets Corp.
Address of head or principal office New York, New York, U.S.
CIBC Bank USA [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Bank USA
Address of head or principal office Chicago, Illinois, U.S.
CIBC Private Wealth Group, LLC [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Private Wealth Group, LLC
Address of head or principal office Atlanta, Georgia, U.S.
CIBC Delaware Trust Company [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Delaware Trust Company
Address of head or principal office Wilmington, Delaware, U.S.
CIBC National Trust Company [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC National Trust Company
Address of head or principal office Atlanta, Georgia, U.S.
CIBC Private Wealth Advisors, Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Private Wealth Advisors, Inc.
Address of head or principal office Chicago, Illinois, U.S.
CIBC Investor Services Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Investor Services Inc.
Address of head or principal office Toronto, Ontario, Canada
Book value of shares owned by CIBC $ 25
CIBC Life Insurance Company Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Life Insurance Company Limited
Address of head or principal office Toronto, Ontario, Canada
Book value of shares owned by CIBC $ 23
CIBC Mortgage Funding Inc. [Member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Mortgage Funding Inc.
Address of head or principal office Toronto, Ontario, Canada
Book value of shares owned by CIBC $ 4,000
CIBC Mortgages Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Mortgages Inc.
Address of head or principal office Toronto, Ontario, Canada
Book value of shares owned by CIBC $ 230
CIBC Securities Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Securities Inc.
Address of head or principal office Toronto, Ontario, Canada
Book value of shares owned by CIBC $ 72
CIBC Trust Corporation [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Trust Corporation
Address of head or principal office Toronto, Ontario, Canada
Book value of shares owned by CIBC $ 591
CIBC World Markets Inc [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC World Markets Inc.
Address of head or principal office Toronto, Ontario, Canada
Book value of shares owned by CIBC $ 306
CIBC Wood Gundy Financial Services Inc [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Wood Gundy Financial Services Inc.
Address of head or principal office Toronto, Ontario, Canada
CIBC Wood Gundy Financial Services (Quebec) Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Wood Gundy Financial Services (Quebec) Inc.
Address of head or principal office Montreal, Quebec, Canada
INTRIA Items Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name INTRIA Items Inc.
Address of head or principal office Mississauga, Ontario, Canada
Book value of shares owned by CIBC $ 100
CIBC Australia Ltd [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Australia Ltd.
Address of head or principal office Sydney, New South Wales, Australia
Book value of shares owned by CIBC $ 19
CIBC Capital Markets (Europe) S.A. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Capital Markets (Europe) S.A.
Address of head or principal office Luxembourg
Book value of shares owned by CIBC $ 1,757
CIBC Cayman Holdings Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Cayman Holdings Limited
Address of head or principal office George Town, Grand Cayman, Cayman Islands
Book value of shares owned by CIBC $ 1,742
CIBC Cayman Bank Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Cayman Bank Limited
Address of head or principal office George Town, Grand Cayman, Cayman Islands
CIBC Cayman Capital Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Cayman Capital Limited
Address of head or principal office George Town, Grand Cayman, Cayman Islands
CIBC Cayman Reinsurance Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Cayman Reinsurance Limited
Address of head or principal office George Town, Grand Cayman, Cayman Islands
CIBC Investments (Cayman) Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Investments (Cayman) Limited
Address of head or principal office George Town, Grand Cayman, Cayman Islands
Book value of shares owned by CIBC $ 2,820
CIBC Caribbean Bank Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Caribbean Bank Limited
Address of head or principal office Warrens, St. Michael, Barbados
CIBC Caribbean Bank and Trust Company (Cayman) Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Caribbean Bank and Trust Company (Cayman) Limited
Address of head or principal office George Town, Grand Cayman, Cayman Islands
CIBC Fund Administration Services (Asia) Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Fund Administration Services (Asia) Limited
Address of head or principal office Hong Kong, China
CIBC Caribbean Bank (Bahamas) Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Caribbean Bank (Bahamas) Limited
Address of head or principal office Nassau, The Bahamas
Sentry Insurance Brokers Ltd. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name Sentry Insurance Brokers Ltd.
Address of head or principal office Nassau, The Bahamas
CIBC Caribbean Bank (Barbados) Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Caribbean Bank (Barbados) Limited
Address of head or principal office Warrens, St. Michael, Barbados
CIBC Caribbean Bank (Cayman) Limited [Member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Caribbean Bank (Cayman) Limited
Address of head or principal office George Town, Grand Cayman, Cayman Islands
FirstCaribbean International Finance Corporation (Netherlands Antilles) N.V. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name FirstCaribbean International Finance Corporation (Netherlands Antilles) N.V.
Address of head or principal office Curaçao, Netherlands Antilles
FirstCaribbean International Bank (Curacao) N.V. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name FirstCaribbean International Bank (Curaçao) N.V.
Address of head or principal office Curaçao, Netherlands Antilles
CIBC Caribbean Bank (Jamaica) Limited [Member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Caribbean Bank (Jamaica) Limited
Address of head or principal office Kingston, Jamaica
CIBC Caribbean Bank (Trinidad and Tobago) Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Caribbean Bank (Trinidad and Tobago) Limited
Address of head or principal office Maraval, Port of Spain, Trinidad & Tobago
CIBC Caribbean Trust Company (Bahamas) Limited [Member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Caribbean Trust Company (Bahamas) Limited
Address of head or principal office Nassau, The Bahamas
CIBC Caribbean Wealth Management Bank (Barbados) Limited [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC Caribbean Wealth Management Bank (Barbados) Limited
Address of head or principal office Warrens, St. Michael, Barbados
CIBC World Markets (Japan) Inc. [member]  
Disclosure of subsidiaries [line items]  
Subsidiary name CIBC World Markets (Japan) Inc.
Address of head or principal office Tokyo, Japan
Book value of shares owned by CIBC $ 48