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IFRS 7 - Disclosure - Market Risk - Summary of Structural Interest Rate Sensitivity - Measures (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jan. 31, 2025
Apr. 30, 2025
Apr. 30, 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 $ 121 $ 305
Increase (decrease) in EVE (1,515) (1,512) (1,187)
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) (189) (361)
Increase (decrease) in EVE 1,439 1,366 1,104
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 84 216
Increase (decrease) in EVE (1,061) (1,055) (820)
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) (148) (273)
Increase (decrease) in EVE 975 903 724
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 37 89
Increase (decrease) in EVE (454) (457) (367)
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) (41) (88)
Increase (decrease) in EVE $ 464 $ 463 $ 380