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IFRS 7 Disclosures - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Parenthetical) (Detail)
CAD in Millions, $ in Millions
Dec. 31, 2017
CAD
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2016
USD ($)
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [Line Items]        
Amount at risk net of reinsurance | CAD CAD 6,683   CAD 10,169  
U.S [Member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [Line Items]        
Amount at risk net of reinsurance   $ 3,982   $ 6,008
Canada [Member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [Line Items]        
Amount at risk net of reinsurance | CAD CAD 1,342   CAD 1,499  
Japan [Member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [Line Items]        
Amount at risk net of reinsurance   95   206
Asia [Member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [Line Items]        
Amount at risk net of reinsurance   $ 181   $ 244