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Equity (Summary of Classes of Share Capital - Preferred Shares and Other Equity Instruments) (Details) - CAD ($)
shares in Thousands, $ in Millions
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2023
Disclosure of classes of share capital [line items]      
Number of shares 1,689,000 1,750,000  
Amount $ 127,827 $ 115,160  
Preferred shares and other equity instruments [member]      
Disclosure of classes of share capital [line items]      
Amount $ 11,625 $ 10,888 $ 10,853
Issued capital [member] | Preferred shares and other equity instruments [member]      
Disclosure of classes of share capital [line items]      
Number of shares 56,901 97,401  
Amount $ 11,625 $ 10,888  
Issued capital [member] | Other equity securities [member]      
Disclosure of classes of share capital [line items]      
Number of shares 7,251 5,751  
Amount $ 8,775 $ 6,988  
Issued capital [member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Number of shares 49,650 91,650  
Amount $ 2,850 $ 3,900  
Issued capital [member] | Preferred shares class A series 1 [member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Number of shares 20,000 20,000  
Amount $ 500 $ 500  
Issued capital [member] | Preferred shares class A series 5 [member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Number of shares 0 20,000  
Amount $ 0 $ 500  
Issued capital [member] | Preferred shares class A series 7 [member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Number of shares 0 14,000  
Amount $ 0 $ 350  
Issued capital [member] | Preferred shares class A series 9 [member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Number of shares 0 8,000  
Amount $ 0 $ 200  
Issued capital [member] | Preferred shares class A series 16 [member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Number of shares 14,000 14,000  
Amount $ 350 $ 350  
Issued capital [member] | Preferred shares class A series 18 [member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Number of shares 14,000 14,000  
Amount $ 350 $ 350  
Issued capital [member] | Preferred shares class A series 27 [member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Number of shares 850 850  
Amount $ 850 $ 850  
Issued capital [member] | Preferred shares class A series 28 [member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Number of shares 800 800  
Amount $ 800 $ 800  
Issued capital [member] | Limited Recourse Capital Notes - Series 1 [member] | Other equity securities [member]      
Disclosure of classes of share capital [line items]      
Number of shares 1,750 1,750  
Amount $ 1,750 $ 1,750  
Issued capital [member] | Limited Recourse Capital Notes - Series 2 [member] | Other equity securities [member]      
Disclosure of classes of share capital [line items]      
Number of shares 1,500 1,500  
Amount $ 1,500 $ 1,500  
Issued capital [member] | Limited Recourse Capital Notes - Series 3 [member] | Other equity securities [member]      
Disclosure of classes of share capital [line items]      
Number of shares 1,750 1,750  
Amount $ 2,403 $ 2,403  
Issued capital [member] | Limited Recourse Capital Notes - Series 4 [Member] | Other equity securities [member]      
Disclosure of classes of share capital [line items]      
Number of shares 750 750  
Amount $ 1,023 $ 1,023  
Issued capital [member] | Limited Recourse Capital Notes - Series 5 [Member] | Other equity securities [member]      
Disclosure of classes of share capital [line items]      
Number of shares 750 0  
Amount $ 750 $ 0  
Issued capital [member] | Limited Recourse Capital Notes - Series 6 [Member] | Other equity securities [member]      
Disclosure of classes of share capital [line items]      
Number of shares 750 0  
Amount $ 1,037 $ 0  
Issued capital [member] | Perpetual Subordinated Capital Notes - Series 2023-9 [Member] | Other equity securities [member]      
Disclosure of classes of share capital [line items]      
Number of shares 1 1  
Amount $ 312 $ 312