v3.26.1
Equity (Narrative) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Aug. 26, 2026
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2026
Jul. 31, 2025
Jan. 20, 2026
Jan. 16, 2026
Feb. 24, 2025
Disclosure of classes of share capital [line items]                  
Stock repurchase program number of shares repurchased   14,500,000   37,700,000          
Number of shares repurchased price per share       $ 143.31          
Purchased during period   $ 2,400   $ 5,400          
Other equity instruments [member] | Limited Recourse Capital Notes [Member]                  
Disclosure of classes of share capital [line items]                  
Issue of shares   $ 1,250 $ 0   $ 1,250 $ 750      
Interest rate   5.918%   5.918% 5.918%        
Notes, interest rate reset period         5 years        
Interest rate basis on variable rates   2.85%   2.85% 2.85%        
Borrowings maturity date         Jul. 31, 2086        
Issue of shares (shares)   1,250,000 0   1,250,000 750,000      
Bottom of range [member] | Other equity instruments [member] | Limited Recourse Capital Notes [Member]                  
Disclosure of classes of share capital [line items]                  
Redemption notice period         10 days        
Top of range [member] | Other equity instruments [member] | Limited Recourse Capital Notes [Member]                  
Disclosure of classes of share capital [line items]                  
Redemption notice period         60 days        
Top of range [member] | 2025 NCIB [member]                  
Disclosure of classes of share capital [line items]                  
Common stock shares authorized to be repurchased                 100,000,000
Stock repurchase program authorized amount                 $ 8,000
Top of range [member] | 2026 NCIB [member]                  
Disclosure of classes of share capital [line items]                  
Common stock shares authorized to be repurchased               61,000,000  
Stock repurchase program authorized amount             $ 7,000 $ 7,000  
Dividend Reinvestment Plan [Member] | Bottom of range [member]                  
Disclosure of classes of share capital [line items]                  
Percentage of discount given to shareholders for reinvestment of dividend into additional common shares         0.00%        
Dividend Reinvestment Plan [Member] | Top of range [member]                  
Disclosure of classes of share capital [line items]                  
Percentage of discount given to shareholders for reinvestment of dividend into additional common shares         5.00%        
No Discount [Member] | Dividend Reinvestment Plan [Member]                  
Disclosure of classes of share capital [line items]                  
Percent of discount from share issuance           0.00%      
Ordinary Share Transactions [Member]                  
Disclosure of classes of share capital [line items]                  
Dividends common stock $ 1.12