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Preferred Shares - Preferred Share Dividends Declared (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 01, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Series A        
Disclosure of classes of share capital [line items]        
Dividends declared   $ 9 $ 5 $ 9
Dividend rate on preference shares, spread 2.03%      
Series B        
Disclosure of classes of share capital [line items]        
Dividends declared   $ 1 1 1
Dividend rate on preference shares, spread 2.03% 2.03%    
Series C        
Disclosure of classes of share capital [line items]        
Dividends declared   $ 14 8 14
Dividend rate on preference shares, spread   3.10%    
Series E        
Disclosure of classes of share capital [line items]        
Dividends declared   $ 15 9 15
Dividend rate on preference shares, spread   3.65%    
Series G        
Disclosure of classes of share capital [line items]        
Dividends declared   $ 10 7 11
Dividend rate on preference shares, spread   3.80%    
Preferred Shares        
Disclosure of classes of share capital [line items]        
Dividends declared   $ 49 $ 30 $ 50