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IFRS 7 - Disclosure - Market Risk - Summary of Structural Interest Rate Sensitivity - Measures (Detail) - CAD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2025
Oct. 31, 2024
Jan. 31, 2024
100 basis point increase in interest rates [member]      
Disclosure foreign currency sensitivity analysis effect on equity [line items]      
Increase (decrease) in net interest income $ 150 $ 204 $ 277
Increase (decrease) in EVE (1,515) (1,356) (1,150)
100 basis point decrease in interest rates [member]      
Disclosure foreign currency sensitivity analysis effect on equity [line items]      
Increase (decrease) in net interest income (218) (242) (328)
Increase (decrease) in EVE 1,439 1,237 1,087
Canadian currency [member] | 100 basis point increase in interest rates [member]      
Disclosure foreign currency sensitivity analysis effect on equity [line items]      
Increase (decrease) in net interest income 109 159 163
Increase (decrease) in EVE (1,061) (956) (787)
Canadian currency [member] | 100 basis point decrease in interest rates [member]      
Disclosure foreign currency sensitivity analysis effect on equity [line items]      
Increase (decrease) in net interest income (174) (193) (217)
Increase (decrease) in EVE 975 829 708
Denominated in U.S. dollars [member] | 100 basis point increase in interest rates [member]      
Disclosure foreign currency sensitivity analysis effect on equity [line items]      
Increase (decrease) in net interest income 41 45 114
Increase (decrease) in EVE (454) (400) (363)
Denominated in U.S. dollars [member] | 100 basis point decrease in interest rates [member]      
Disclosure foreign currency sensitivity analysis effect on equity [line items]      
Increase (decrease) in net interest income (44) (49) (111)
Increase (decrease) in EVE $ 464 $ 408 $ 379