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Per Share Amounts - Preferred Share Dividends (Details) - CAD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Earnings per share [line items]    
Total Preferred Share Dividends Declared $ 12 $ 27
Series 1 First Preferred Shares    
Earnings per share [line items]    
Total Preferred Share Dividends Declared 5 5
Series 2 First Preferred Shares    
Earnings per share [line items]    
Total Preferred Share Dividends Declared 1 2
Series 3 First Preferred Shares    
Earnings per share [line items]    
Total Preferred Share Dividends Declared 0 9
Series 5 First Preferred Shares    
Earnings per share [line items]    
Total Preferred Share Dividends Declared 2 7
Series 7 First Preferred Shares    
Earnings per share [line items]    
Total Preferred Share Dividends Declared $ 4 $ 4