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Fair Value Measurements and Trading-Related Revenue - Summary of Financial Instruments Designated At Fair Value Through Profit Or Loss (Parenthetical) (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Fair Value of Financial Instruments Not Carried at Fair Value on the Balance Sheet [line items]    
Business and government $ 380,788 $ 384,993
Securitization and structured entities' liabilities 51,562 40,164
Amortized cost 96,610 115,188
Financial liabilities at fair value through profit or loss, category [member]    
Fair Value of Financial Instruments Not Carried at Fair Value on the Balance Sheet [line items]    
Structured note liabilities 49,093 45,222
Metal deposits 3,973 1,807
Embedded options related to structured deposits carried at amortized cost 1,967 1,047
Securitization and structured entities' liabilities 31,351 18,314
Money market deposits 1,129 6,032
At fair value [member]    
Fair Value of Financial Instruments Not Carried at Fair Value on the Balance Sheet [line items]    
Amortized cost 90,448 106,461
Level 2 of fair value hierarchy [member] | At fair value [member]    
Fair Value of Financial Instruments Not Carried at Fair Value on the Balance Sheet [line items]    
Amortized cost 90,448 106,389
Level 3 of fair value hierarchy [member] | At fair value [member]    
Fair Value of Financial Instruments Not Carried at Fair Value on the Balance Sheet [line items]    
Amortized cost 0 72
Financial assets at fair value through profit or loss [member]    
Fair Value of Financial Instruments Not Carried at Fair Value on the Balance Sheet [line items]    
Residential mortgages loans 79 163
Business and government 13,231 12,431
Financial assets at fair value through other comprehensive income [member]    
Fair Value of Financial Instruments Not Carried at Fair Value on the Balance Sheet [line items]    
Business and government $ 14 $ 61