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Share Capital - Outstanding Common Shares (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of number of shares outstanding [abstract]      
Balance – beginning of year $ 31,974 $ 31,653  
Issued upon exercise of stock options (in shares) 10,871,000 9,975,000  
Purchase of common shares under Normal Course Issuer Bid (In shares) (25,900,000)    
Purchase of common shares under Normal Course Issuer Bid $ (941)    
Balance – end of year 34,991 $ 31,974 $ 31,653
Share capital      
Reconciliation of number of shares outstanding [abstract]      
Balance – beginning of year 9,323 9,109 4,671
Issued upon exercise of stock options 360 332 466
Previously recognized liability on stock options exercised for common shares 53 120 154
Purchase of common shares under Normal Course Issuer Bid (203) (238) 0
Balance – end of year $ 9,533 $ 9,323 $ 9,109
Ordinary shares | Share capital      
Reconciliation of number of shares outstanding [abstract]      
Balance - beginning of year (in shares) 1,201,886,000 1,222,769,000  
Balance – beginning of year $ 9,323    
Issued upon exercise of stock options (in shares) 10,871,000 9,975,000  
Issued upon exercise of stock options $ 360 $ 332  
Previously recognized liability on stock options exercised for common shares $ 53 $ 120  
Purchase of common shares under Normal Course Issuer Bid (In shares) (25,900,000) (30,858,000)  
Purchase of common shares under Normal Course Issuer Bid $ (203) $ (238)  
Balance - end of year (in shares) 1,186,857,000 1,201,886,000 1,222,769,000
Balance – end of year $ 9,533 $ 9,323