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Per Share Amounts - Preferred Share Dividends (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings per share [line items]        
Total Declared and Paid Preferred Share Dividends $ 8 $ 8 $ 17 $ 17
Series 1 First Preferred Shares        
Earnings per share [line items]        
Total Declared and Paid Preferred Share Dividends 2 2 4 4
Series 2 First Preferred Shares        
Earnings per share [line items]        
Total Declared and Paid Preferred Share Dividends 0 0 0 0
Series 3 First Preferred Shares        
Earnings per share [line items]        
Total Declared and Paid Preferred Share Dividends 3 3 6 6
Series 5 First Preferred Shares        
Earnings per share [line items]        
Total Declared and Paid Preferred Share Dividends 2 2 4 4
Series 7 First Preferred Shares        
Earnings per share [line items]        
Total Declared and Paid Preferred Share Dividends $ 1 $ 1 $ 3 $ 3