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