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Preferred Shares - Preferred Share Dividends Declared (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Series A    
Disclosure of classes of share capital [line items]    
Dividends declared $ 7 $ 9
Series B    
Disclosure of classes of share capital [line items]    
Dividends declared $ 1 $ 1
Dividend rate on preference shares, spread 2.03% 2.03%
Series C    
Disclosure of classes of share capital [line items]    
Dividends declared $ 11 $ 14
Series E    
Disclosure of classes of share capital [line items]    
Dividends declared 12 15
Series G    
Disclosure of classes of share capital [line items]    
Dividends declared 8 10
Preferred Shares    
Disclosure of classes of share capital [line items]    
Dividends declared $ 39 $ 49