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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, CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year CAD 42,823  
Balance, end of year 42,163 CAD 42,823
Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Balance, beginning of year 3,577 2,693
Issued, amount   900
Issuance costs, net of tax 0 (16)
Balance, end of year CAD 3,577 CAD 3,577
Balance, beginning of year 146 110
Balance, end of year 146 146
Class 1, Series 21 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issued, amount CAD 0 CAD 425
Number of shares, issued 0 17
Balance, end of year 17  
Class 1, Series 3 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Converted, amount CAD 0 CAD (42)
Number of shares, converted 0 (2)
Balance, end of year 6  
Class 1, Series 4 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issued, amount CAD 0 CAD 42
Number of shares, issued 0 2
Balance, end of year 2  
Class 1, Series 23 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issued, amount CAD 0 CAD 475
Number of shares, issued 0 19
Balance, end of year 19