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Preferred Shares - Issued and Outstanding (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Mar. 17, 2016
Disclosure of classes of share capital [line items]      
Number of shares issued and outstanding     1,824,620
Preferred Shares      
Disclosure of classes of share capital [line items]      
Number of shares outstanding 38,600,000 38,600,000  
Number of shares issued and outstanding 38,600,000 38,600,000  
Issued capital (Note 25) $ 942 $ 942  
Series A      
Disclosure of classes of share capital [line items]      
Number of shares outstanding 10,200,000 10,200,000 12,000,000.0
Number of shares issued and outstanding 10,200,000 10,200,000  
Issued capital (Note 25) $ 248 $ 248  
Series B      
Disclosure of classes of share capital [line items]      
Number of shares outstanding 1,800,000 1,800,000  
Number of shares issued and outstanding 1,800,000 1,800,000  
Issued capital (Note 25) $ 45 $ 45  
Series C      
Disclosure of classes of share capital [line items]      
Number of shares outstanding 11,000,000.0 11,000,000.0  
Number of shares issued and outstanding 11,000,000.0 11,000,000.0  
Issued capital (Note 25) $ 269 $ 269  
Series E      
Disclosure of classes of share capital [line items]      
Number of shares outstanding 9,000,000.0 9,000,000.0  
Number of shares issued and outstanding 9,000,000.0 9,000,000.0  
Issued capital (Note 25) $ 219 $ 219  
Series G      
Disclosure of classes of share capital [line items]      
Number of shares outstanding 6,600,000 6,600,000  
Number of shares issued and outstanding 6,600,000 6,600,000  
Issued capital (Note 25) $ 161 $ 161