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Shareholders Equity - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 19, 2020
Dec. 31, 2019
Oct. 23, 2019
May 14, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 17, 2019
Oct. 19, 2018
May 10, 2017
Preferred shares issued   0     0          
Common Shares repurchased         3,800,000 4,600,000 1,900,000      
Common Shares repurchased (value)         $ 1,140 $ 1,127 $ 381      
2017 Normal Course Issuer Bid                    
Common shares authorized to be repurchased                   4,380,000
Share repurchase program expiration date       May 14, 2018            
Common Shares repurchased             1,888,100      
Common Shares repurchased (value)             $ 381      
2018 Normal Course Issuer Bid                    
Common shares authorized to be repurchased                 5,680,000  
Share repurchase program expiration date     Oct. 23, 2019              
Common Shares repurchased           4,683,162        
Common Shares repurchased (value)           $ 1,127        
Current Normal Course Issuer Bid                    
Common shares authorized to be repurchased               4,800,000    
Share repurchase program expiration date Dec. 19, 2020                  
Common Shares repurchased   300,000                
Common Shares repurchased (value)   $ 100                
Share capital                    
Stock-based compensation transferred from APIC         7 12 12      
Common Shares repurchased (value)         $ 54 $ 66 $ 27