v3.22.2.2
Guarantees, commitments, pledged assets and contingencies - Summary of Maximum Exposure to Credit Losses Related to Guarantees and Commitments Provided to Third Parties (Detail) - CAD ($)
$ in Millions
Oct. 31, 2022
Oct. 31, 2021
Financial guarantees [member] | Financial standby letters of credit [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit losses $ 20,291 $ 16,867
Commitments to extend credit [member] | Backstop liquidity facilities [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit losses 45,336 38,405
Commitments to extend credit [member] | Credit enhancements [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit losses 2,960 2,537
Commitments to extend credit [member] | Documentary and commercial letters of credit [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit losses 318 447
Commitments to extend credit [member] | Other commitments to extend credit [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit losses 284,602 248,522
Other Credit-Related Commitments [Member] | Securities lending indemnifications [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit losses 90,693 99,797
Other Credit-Related Commitments [Member] | Performance guarantees [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit losses 7,333 7,195
Other Credit-Related Commitments [Member] | Other [Member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit losses 360 326
Other Credit-Related Commitments [Member] | Sponsored Member Guarantees [Member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit losses $ 1,241 $ 142