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IFRS 7 Disclosures - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Parenthetical) (Detail)
$ in Millions, $ in Millions
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance $ 2,757   $ 3,733  
U.S. [member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance   $ 1,336   $ 1,839
Canada [member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance $ 886   $ 1,159  
Japan [Member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance   53   71
Asia [member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance   $ 87   $ 111