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IFRS 7 Disclosures - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Parenthetical) (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance $ 12,853   $ 6,683  
U.S. [member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance   $ 6,899   $ 3,982
Canada [member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance $ 2,654   $ 1,342  
Japan [Member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance   332   95
Asia [member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance   $ 246   $ 181