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Per Share Amounts - Additional Information (Details) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disclosure of non-adjusting events after reporting period [line items]          
Total dividends paid on preferred shares       $ 12 $ 27
Common shares          
Disclosure of non-adjusting events after reporting period [line items]          
Instruments excluded from calculation, shares (in shares)   25.1 3.0 24.6 11.5
Preferred Shares          
Disclosure of non-adjusting events after reporting period [line items]          
Total dividends paid on preferred shares       $ 10 $ 27
Potential ordinary share transactions | Common shares          
Disclosure of non-adjusting events after reporting period [line items]          
Dividends declared (in CAD per share) $ 0.200        
Potential ordinary share transactions | Preferred Shares          
Disclosure of non-adjusting events after reporting period [line items]          
Dividends declared $ 2