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Share Capital - Normal Course Issuer Bid (Details) - CAD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 12, 2024
Feb. 03, 2023
Feb. 08, 2022
Jan. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Feb. 26, 2024
Feb. 17, 2023
Share Capital                
Shares repurchased         51,982,000 116,908,000    
Average repurchase cost per share         $ 42.96 $ 43.92    
Share repurchase cost         $ 2,233 $ 5,135    
Common shares issued and outstanding 1,287,461,183 1,330,006,760            
2024 NCIB                
Share Capital                
Purchase of shares for cancellation, shares authorized             128,700,000  
Shares authorized for repurchase as a percentage of public float 10.00%              
2023 NCIB                
Share Capital                
Purchase of shares for cancellation, shares authorized               132,900,000
Shares authorized for repurchase as a percentage of public float   10.00%            
Shares repurchased         43,700,000      
2022 NCIB                
Share Capital                
Purchase of shares for cancellation, shares authorized     71,650,000          
Shares authorized for repurchase as a percentage of public float     5.00% 5.00%        
Shares repurchased         8,300,000      
2022 NCIB, as Amended on May 11, 2022                
Share Capital                
Purchase of shares for cancellation, shares authorized     143,500,000          
Shares authorized for repurchase as a percentage of public float       10.00%        
Shares repurchased           109,800,000    
Average repurchase cost per share           $ 43.92    
2021 NCIB                
Share Capital                
Shares repurchased           7,100,000