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Share Capital - Outstanding Common Shares (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
shares
Dec. 31, 2019
CAD ($)
shares
Dec. 31, 2018
CAD ($)
shares
Reconciliation of number of shares outstanding [abstract]      
Balance – beginning of year $ 34,991 $ 31,974  
Issued upon exercise of stock options (in shares) | shares 757,000 1,003,000  
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares (6,970,000)    
Purchase of common shares under Normal Course Issuer Bid $ (271)    
Balance – end of year 32,380 $ 34,991 $ 31,974
Share capital      
Reconciliation of number of shares outstanding [abstract]      
Balance – beginning of year 9,533 9,323 9,109
Issued upon exercise of stock options 108 360 332
Previously recognized liability on stock options exercised for common shares 21 53 120
Purchase of common shares under Normal Course Issuer Bid (56) (203) (238)
Balance – end of year $ 9,606 $ 9,533 $ 9,323
Ordinary shares | Share capital      
Reconciliation of number of shares outstanding [abstract]      
Balance - beginning of year (in shares) | shares 1,186,857,000 1,201,886,000  
Balance – beginning of year $ 9,533    
Issued upon exercise of stock options (in shares) | shares 3,979,000 10,871,000  
Previously recognized liability on stock options exercised for common shares $ 21    
Purchase of common shares under Normal Course Issuer Bid (In shares) | shares (6,970,000) (25,900,000)  
Balance - end of year (in shares) | shares 1,183,866,000 1,186,857,000 1,201,886,000
Balance – end of year $ 9,606 $ 9,533