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Share Capital - Outstanding Common Shares (Details)
$ in Millions
 2 Months Ended 12 Months Ended
Feb. 27, 2024
CAD ($)
shares
Dec. 31, 2023
CAD ($)
shares
Dec. 31, 2022
CAD ($)
shares
Dec. 31, 2021
CAD ($)
shares
Reconciliation of number of shares outstanding [abstract]        
Balance – beginning of year $ 39,832 $ 38,175 $ 36,945  
Issued upon exercise of stock options (in shares) | shares   9,822,000 11,605,000  
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares (4,000,000) (40,050,000)    
Purchase of common shares under Normal Course Issuer Bid $ (342) $ (3,318)    
Balance – end of year   39,832 $ 38,175 $ 36,945
Share capital        
Reconciliation of number of shares outstanding [abstract]        
Balance – beginning of year $ 10,712 10,294 10,168 9,606
Issued upon exercise of stock options   372 442 707
Previously recognized liability on stock options exercised ‍for common shares   435 387 139
Balance – end of year   $ 10,712 $ 10,294 10,168
Ordinary shares | Share capital        
Reconciliation of number of shares outstanding [abstract]        
Balance - beginning of year (in shares) | shares 1,072,408,000 1,102,636,000 1,168,369,000  
Balance – beginning of year $ 10,712 $ 10,294 $ 10,168  
Issued upon exercise of stock options (in shares) | shares   9,822,000 11,605,000  
Issued upon exercise of stock options   $ 372 $ 442  
Previously recognized liability on stock options exercised ‍for common shares   $ 435 $ 387  
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares   (40,050,000) (77,338,000)  
Purchase of common shares under Normal Course Issuer Bid   $ (389) $ (703) $ (284)
Balance - end of year (in shares) | shares   1,072,408,000 1,102,636,000 1,168,369,000
Balance – end of year   $ 10,712 $ 10,294 $ 10,168