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IFRS 7 Disclosures - Variable Annuity and Segregated Fund Guarantees, Net of Reinsurance (Parenthetical) (Detail)
$ in Millions, $ in Millions
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance $ 3,829   $ 2,757  
U.S. [member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance   $ 737   $ 1,336
Canada [member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance $ 2,154   $ 886  
Japan [Member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance   275   53
Asia [member]        
Variable Annuity And Segregated Fund Guarantees Net Of Reinsurance [line items]        
Amount at risk net of reinsurance   $ 224   $ 87