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Share Capital - Outstanding Common Shares (Details)
$ in Millions
 2 Months Ended 12 Months Ended
Feb. 28, 2023
CAD ($)
shares
Dec. 31, 2022
CAD ($)
shares
Dec. 31, 2021
CAD ($)
shares
Dec. 31, 2020
CAD ($)
shares
Reconciliation of number of shares outstanding [abstract]        
Balance – beginning of year $ 38,175 $ 36,945 $ 32,380  
Issued upon exercise of stock options (in shares) | shares   11,605,000 18,147,000  
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares (6,000,000) (77,338,200)    
Purchase of common shares under Normal Course Issuer Bid $ (466) $ (5,571)    
Balance – end of year   38,175 $ 36,945 $ 32,380
Share capital        
Reconciliation of number of shares outstanding [abstract]        
Balance – beginning of year $ 10,294 10,168 9,606 9,533
Issued upon exercise of stock options   442 707 108
Previously recognized liability on stock options exercised ‍for common shares   387 139 21
Balance – end of year   $ 10,294 $ 10,168 9,606
Ordinary shares | Share capital        
Reconciliation of number of shares outstanding [abstract]        
Balance - beginning of year (in shares) | shares 1,102,636,000 1,168,369,000 1,183,866,000  
Balance – beginning of year $ 10,294 $ 10,168 $ 9,606  
Issued upon exercise of stock options (in shares) | shares   11,605,000 18,147,000  
Issued upon exercise of stock options   $ 442 $ 707  
Previously recognized liability on stock options exercised ‍for common shares   $ 387 $ 139  
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares   (77,338,000) (33,644,000)  
Purchase of common shares under Normal Course Issuer Bid   $ (703) $ (284) $ (56)
Balance - end of year (in shares) | shares   1,102,636,000 1,168,369,000 1,183,866,000
Balance – end of year   $ 10,294 $ 10,168 $ 9,606