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Preferred Shares - Preferred Share Dividends Declared (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 12, 2022
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]        
Dividends declared per share (in CAD per share) $ 0.055      
Series A        
Disclosure of classes of share capital [line items]        
Total dividends declared     $ 7 $ 7
Dividends declared per share (in CAD per share) 0.17981      
Series B        
Disclosure of classes of share capital [line items]        
Total dividends declared     $ 3 1
Dividend rate on preference shares     2.00%  
Dividends declared per share (in CAD per share) 0.37991      
Series C        
Disclosure of classes of share capital [line items]        
Total dividends declared     $ 14 11
Dividend rate on preference shares   3.10%    
Dividends declared per share (in CAD per share) 0.36588      
Series D        
Disclosure of classes of share capital [line items]        
Total dividends declared     $ 1 0
Dividend rate on preference shares   3.10% 3.10%  
Dividends declared per share (in CAD per share) 0.45578      
Series E        
Disclosure of classes of share capital [line items]        
Total dividends declared     $ 13 12
Dividend rate on preference shares     3.65%  
Dividends declared per share (in CAD per share) 0.43088      
Series G        
Disclosure of classes of share capital [line items]        
Total dividends declared     $ 8 8
Dividends declared per share (in CAD per share) $ 0.31175      
Preferred Shares        
Disclosure of classes of share capital [line items]        
Total dividends declared     $ 46 $ 39