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IFRS 7 Disclosures - Summary of Potential Impact on Core Earnings (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
10% change in the Canadian dollar relative to the U.S. dollar and the Hong Kong dollar [Member] | 10% [Member]    
Disclosure of foreign exchange risk [line items]    
Potential impact on core earnings CAD (280) CAD (230)
10% change in the Canadian dollar relative to the U.S. dollar and the Hong Kong dollar [Member] | -10% [Member]    
Disclosure of foreign exchange risk [line items]    
Potential impact on core earnings 280 230
10% change in the Canadian dollar relative to the Japanese yen [Member] | 10% [Member]    
Disclosure of foreign exchange risk [line items]    
Potential impact on core earnings (60) (50)
10% change in the Canadian dollar relative to the Japanese yen [Member] | -10% [Member]    
Disclosure of foreign exchange risk [line items]    
Potential impact on core earnings CAD 60 CAD 50