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Fair Value Measurements and Trading-Related Revenue - Summary of Financial Instruments Designated At Fair Value Through Profit Or Loss (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Securities    
Amortized cost $ 96,610 $ 115,188
Loans    
Consumer instalment and other personal 92,741 92,687
Credit cards 12,649 13,612
Business and government 380,788 384,993
Deposits 976,202 982,440
Securitization and structured entities' liabilities 51,562 40,164
Other liabilities 37,549 36,720
Subordinated debt 8,500 8,377
Fair Value [member]    
Securities    
Amortized cost 90,448 106,461
Not Carried At Fair Value [member] | At carrying value [member]    
Securities    
Amortized cost 96,610 115,188
Loans    
Residential mortgages 195,708 190,666
Consumer instalment and other personal 91,867 91,889
Credit cards 11,997 13,030
Business and government 364,265 369,776
Loans net of allowance for loan losses 663,837 665,361
Deposits 920,040 928,332
Securitization and structured entities' liabilities 20,211 21,850
Other liabilities 3,103 2,929
Subordinated debt 8,500 8,377
Not Carried At Fair Value [member] | Fair Value [member]    
Securities    
Amortized cost 90,448 106,461
Loans    
Residential mortgages 194,755 188,848
Consumer instalment and other personal 91,937 91,513
Credit cards 11,997 13,030
Business and government 364,866 370,101
Loans net of allowance for loan losses 663,555 663,492
Deposits 920,927 928,689
Securitization and structured entities' liabilities 20,100 21,653
Other liabilities 2,953 2,669
Subordinated debt $ 8,756 $ 8,543