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Per Share Amounts - Preferred Share Dividends (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Earnings per share [line items]    
Total Preferred Share Dividends Declared $ 35 $ 34
Series 1 First Preferred Shares    
Earnings per share [line items]    
Total Preferred Share Dividends Declared 7 7
Series 2 First Preferred Shares    
Earnings per share [line items]    
Total Preferred Share Dividends Declared 1 1
Series 3 First Preferred Shares    
Earnings per share [line items]    
Total Preferred Share Dividends Declared 12 12
Series 5 First Preferred Shares    
Earnings per share [line items]    
Total Preferred Share Dividends Declared 9 9
Series 7 First Preferred Shares    
Earnings per share [line items]    
Total Preferred Share Dividends Declared $ 6 $ 5