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Per Share Amounts - Preferred Share Dividends (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Earnings per share [line items]    
Total Declared and Paid Preferred Share Dividends $ 9 $ 26
Series 1 First Preferred Shares    
Earnings per share [line items]    
Total Declared and Paid Preferred Share Dividends 2 6
Series 2 First Preferred Shares    
Earnings per share [line items]    
Total Declared and Paid Preferred Share Dividends 0 0
Series 3 First Preferred Shares    
Earnings per share [line items]    
Total Declared and Paid Preferred Share Dividends 3 9
Series 5 First Preferred Shares    
Earnings per share [line items]    
Total Declared and Paid Preferred Share Dividends 3 7
Series 7 First Preferred Shares    
Earnings per share [line items]    
Total Declared and Paid Preferred Share Dividends $ 1 $ 4