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Share Capital and Earnings Per Share - Summary of Changes in Issued and Outstanding Shares - Preferred 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
Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year 3,577 3,577
Issued, amount 250  
Issuance costs, net of tax (5)  
Balance, end of year $ 3,822 $ 3,577
Balance, beginning of year 146 146
Balance, end of year 156 146
Class 1, Series 25 Preferred Shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issued, amount $ 250  
Number of shares, issued 10 0
Balance, end of year 10