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Securities (Summary of Debt Securities by Risk Rating) (Details) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure of financial assets [line items]    
Debt securities $ 363,475 $ 360,870
Allowance for credit losses on debt securities at amortized cost 2 3
Debt securities, net of allowance 363,473 360,867
Stage 1 [member]    
Disclosure of financial assets [line items]    
Debt securities 363,259 360,711
Allowance for credit losses on debt securities at amortized cost 2 3
Debt securities, net of allowance 363,257 360,708
Stage 2 [member]    
Disclosure of financial assets [line items]    
Debt securities 216 159
Allowance for credit losses on debt securities at amortized cost 0 0
Debt securities, net of allowance 216 159
Stage 3 [member]    
Disclosure of financial assets [line items]    
Debt securities 0 0
Allowance for credit losses on debt securities at amortized cost 0 0
Debt securities, net of allowance 0 0
Investment grade [Member]    
Disclosure of financial assets [line items]    
Debt securities 362,521 360,272
Investment grade [Member] | Stage 1 [member]    
Disclosure of financial assets [line items]    
Debt securities 362,521 360,272
Investment grade [Member] | Stage 2 [member]    
Disclosure of financial assets [line items]    
Debt securities 0 0
Non investment grade [member]    
Disclosure of financial assets [line items]    
Debt securities 905 530
Non investment grade [member] | Stage 1 [member]    
Disclosure of financial assets [line items]    
Debt securities 738 439
Non investment grade [member] | Stage 2 [member]    
Disclosure of financial assets [line items]    
Debt securities 167 91
Watch and classified [Member]    
Disclosure of financial assets [line items]    
Debt securities 49 68
Watch and classified [Member] | Stage 2 [member]    
Disclosure of financial assets [line items]    
Debt securities 49 68
Default [member]    
Disclosure of financial assets [line items]    
Debt securities 0 0
Default [member] | Stage 3 [member]    
Disclosure of financial assets [line items]    
Debt securities $ 0 $ 0