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Share Capital and Earnings Per Share - Summary of Changes in Issued and Outstanding Shares - Common Shares (Detail) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year $ 42,163  
Balance, end of year $ 47,151 $ 42,163
Common shares [Member]    
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year 1,982 1,975
Repurchased for cancellation (23)  
Issued under dividend reinvestment plan 9  
Issued on exercise of stock options and deferred share units 3 7
Balance, end of year 1,971 1,982
Balance, beginning of year $ 22,989 $ 22,865
Repurchased for cancellation (269)  
Issued under dividend reinvestment plan 182  
Issued on exercise of stock options and deferred share units 59 124
Balance, end of year $ 22,961 $ 22,989