v3.26.1
Fair value of financial instruments - Summary of Comparison of Carrying and Fair Values for Each Classification of Financial Instrument (Detail) - CAD ($)
$ in Millions
Apr. 30, 2026
Oct. 31, 2025
Financial assets    
Interest-bearing deposits with banks $ 34,146 $ 50,364
Securities    
Trading 236,601 219,067
Investment, net of applicable allowance 375,763 342,721
Securities 612,364 561,788
Assets purchased under reverse repurchase agreements and securities borrowed 316,375 309,683
Loans, net of applicable allowance    
Loans, net 1,077,949 1,042,422
Other    
Derivatives 150,745 177,206
Deposits    
Personal 532,736 529,740
Business and government 984,990 946,314
Bank 63,820 39,562
Deposits 1,581,546 1,515,616
Other    
Obligations related to securities sold short 57,472 49,891
Obligations related to assets sold under repurchase agreements and securities loaned 312,954 289,516
Derivatives 156,627 183,953
Subordinated debentures 13,498 13,961
Financial assets classified as FVTPL [member]    
Securities    
Trading 230,723 212,878
Securities 230,723 212,878
Assets purchased under reverse repurchase agreements and securities borrowed 249,359 226,213
Loans, net of applicable allowance    
Retail 1,153 1,128
Wholesale 10,922 9,724
Loans, net 12,075 10,852
Other    
Derivatives 150,745 177,206
Other assets 21,588 14,382
Financial assets designated as FVTPL [member]    
Financial assets    
Interest-bearing deposits with banks 27,425 40,455
Securities    
Trading 5,878 6,189
Securities 5,878 6,189
Financial assets classified as FVOCI [member]    
Securities    
Investment, net of applicable allowance 274,401 240,299
Securities 274,401 240,299
Loans, net of applicable allowance    
Retail 433 442
Wholesale 696 690
Loans, net 1,129 1,132
Financial assets designated as FVOCI [member]    
Securities    
Investment, net of applicable allowance 1,526 1,496
Securities 1,526 1,496
Financial liabilities classified as FVTPL [member]    
Deposits    
Personal 1,100 942
Business and government 504 313
Deposits 1,604 1,255
Other    
Obligations related to securities sold short 57,472 49,891
Derivatives 156,627 183,953
Financial liabilities designated as FVTPL [member]    
Deposits    
Personal 40,512 41,302
Business and government 169,751 168,690
Bank 4,174 2,908
Deposits 214,437 212,900
Other    
Obligations related to assets sold under repurchase agreements and securities loaned 270,356 242,916
Other liabilities 19,142 21,688
Subordinated debentures 213 232
Fair value of financial instruments not measured at fair value [member] | Financial assets measured at amortized cost [member]    
Financial assets    
Interest-bearing deposits with banks 6,721 9,909
Securities    
Investment, net of applicable allowance 97,293 98,728
Securities 97,293 98,728
Assets purchased under reverse repurchase agreements and securities borrowed 67,016 83,470
Loans, net of applicable allowance    
Retail 658,863 648,413
Wholesale 406,439 382,551
Loans, net 1,065,302 1,030,964
Other    
Other assets 57,470 58,487
Fair value of financial instruments not measured at fair value [member] | Financial liabilities measured at amortized cost [member]    
Deposits    
Personal 491,927 488,644
Business and government 815,727 779,130
Bank 59,631 36,657
Deposits 1,367,285 1,304,431
Other    
Obligations related to assets sold under repurchase agreements and securities loaned 42,598 46,600
Other liabilities 61,495 58,293
Subordinated debentures 13,378 13,887
Financial assets at carrying amount [member]    
Financial assets    
Interest-bearing deposits with banks 34,146 50,364
Securities    
Trading 236,601 219,067
Investment, net of applicable allowance 375,763 342,721
Securities 612,364 561,788
Assets purchased under reverse repurchase agreements and securities borrowed 316,375 309,683
Loans, net of applicable allowance    
Retail 659,298 648,402
Wholesale 418,651 394,020
Loans, net 1,077,949 1,042,422
Other    
Derivatives 150,745 177,206
Other assets 79,058 72,869
Financial assets at carrying amount [member] | Financial assets measured at amortized cost [member]    
Financial assets    
Interest-bearing deposits with banks 6,721 9,909
Securities    
Investment, net of applicable allowance 99,836 100,926
Securities 99,836 100,926
Assets purchased under reverse repurchase agreements and securities borrowed 67,016 83,470
Loans, net of applicable allowance    
Retail 657,712 646,832
Wholesale 407,033 383,606
Loans, net 1,064,745 1,030,438
Other    
Other assets 57,470 58,487
Financial assets at fair value [member]    
Financial assets    
Interest-bearing deposits with banks 34,146 50,364
Securities    
Trading 236,601 219,067
Investment, net of applicable allowance 373,220 340,523
Securities 609,821 559,590
Assets purchased under reverse repurchase agreements and securities borrowed 316,375 309,683
Loans, net of applicable allowance    
Retail 660,449 649,983
Wholesale 418,057 392,965
Loans, net 1,078,506 1,042,948
Other    
Derivatives 150,745 177,206
Other assets 79,058 72,869
Financial liabilities at carrying amount [member]    
Deposits    
Personal 532,736 529,740
Business and government 984,990 946,314
Bank 63,820 39,562
Deposits 1,581,546 1,515,616
Other    
Obligations related to securities sold short 57,472 49,891
Obligations related to assets sold under repurchase agreements and securities loaned 312,954 289,516
Derivatives 156,627 183,953
Other liabilities 80,641 79,975
Subordinated debentures 13,498 13,961
Financial liabilities at carrying amount [member] | Financial liabilities measured at amortized cost [member]    
Deposits    
Personal 491,124 487,496
Business and government 814,735 777,311
Bank 59,646 36,654
Deposits 1,365,505 1,301,461
Other    
Obligations related to assets sold under repurchase agreements and securities loaned 42,598 46,600
Other liabilities 61,499 58,287
Subordinated debentures 13,285 13,729
Financial liabilities at fair value [member]    
Deposits    
Personal 533,539 530,888
Business and government 985,982 948,133
Bank 63,805 39,565
Deposits 1,583,326 1,518,586
Other    
Obligations related to securities sold short 57,472 49,891
Obligations related to assets sold under repurchase agreements and securities loaned 312,954 289,516
Derivatives 156,627 183,953
Other liabilities 80,637 79,981
Subordinated debentures $ 13,591 $ 14,119