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Share Capital - Outstanding Common Shares (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 23, 2022
CAD ($)
shares
Dec. 31, 2021
CAD ($)
shares
Dec. 31, 2020
CAD ($)
shares
Dec. 31, 2019
CAD ($)
shares
Reconciliation of number of shares outstanding [abstract]        
Balance – beginning of year $ 36,945 $ 32,380 $ 34,991  
Issued upon exercise of stock options (in shares) | shares   18,147,000 3,979,000  
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares (10,500,000) (33,644,400)    
Purchase of common shares under Normal Course Issuer Bid $ (680) $ (1,581)    
Balance – end of year   36,945 $ 32,380 $ 34,991
Share capital        
Reconciliation of number of shares outstanding [abstract]        
Balance – beginning of year $ 10,168 9,606 9,533 9,323
Issued upon exercise of stock options   707   360
Previously recognized liability on stock options exercised for common shares   139   53
Purchase of common shares under Normal Course Issuer Bid       (203)
Balance – end of year   $ 10,168 $ 9,606 $ 9,533
Ordinary shares | Share capital        
Reconciliation of number of shares outstanding [abstract]        
Balance - beginning of year (in shares) | shares 1,168,369,000 1,183,866,000 1,186,857,000  
Balance – beginning of year $ 10,168 $ 9,606 $ 9,533  
Issued upon exercise of stock options (in shares) | shares   18,147,000 3,979,000  
Issued upon exercise of stock options   $ 707 $ 108  
Previously recognized liability on stock options exercised for common shares   $ 139 $ 21  
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares   (33,644,000) (6,970,000)  
Purchase of common shares under Normal Course Issuer Bid   $ (284) $ (56)  
Balance - end of year (in shares) | shares   1,168,369,000 1,183,866,000 1,186,857,000
Balance – end of year   $ 10,168 $ 9,606 $ 9,533