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Shareholders Equity - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Jan. 28, 2022
Dec. 19, 2019
Oct. 23, 2019
May 14, 2018
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 27, 2021
Dec. 17, 2019
Oct. 19, 2018
May 10, 2017
Preferred shares issued         0 0            
Common Shares repurchased           4,000,000.0 3,800,000 4,600,000        
Common Shares repurchased (value)           $ 1,477 $ 1,140 $ 1,127        
2019 Normal Course Issuer Bid                        
Common shares authorized to be repurchased                   4,800,000    
Share repurchase program expiration date   Dec. 19, 2020                    
Common Shares repurchased         4,270,000 3,973,076            
Common Shares repurchased (value)         $ 1,577 $ 1,477            
2018 Normal Course Issuer Bid                        
Common shares authorized to be repurchased                     5,680,000  
Share repurchase program expiration date     Oct. 23, 2019                  
2017 Normal Course Issuer Bid                        
Common shares authorized to be repurchased                       4,380,000
Share repurchase program expiration date       May 14, 2018                
2021 Normal Course Issuer Bid | 2021 NCIB Program Announcement                        
Common shares authorized to be repurchased                 3,330,000      
Share repurchase program expiration date Jan. 28, 2022                      
Share capital                        
Stock-based compensation transferred from APIC           10 7 12        
Common Shares repurchased (value)           $ 58 $ 54 $ 66