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Risk Management - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of Risk Management [line items]      
Percentage of debt securities in investment grade with ratings ranging between AAA to BBB 96.00% 97.00%  
Percentage of total mortgage portfolio 13.00% 14.00%  
Loaned securities included in invested assets $ 10,690 $ 20,280  
Reverse repurchase transactions recorded as short-term receivables 895 1,490  
Repurchase transactions recorded as payables $ 895 536  
Term of credit default swaps 5 years    
Credit protection purchased $ 0 0  
Mitigated exposure to credit risk 2,194 10,121  
Largest single counterparty exposure without master netting agreements or the benefit of collateral held 7,949 8,593  
Largest single counterparty exposure with master netting agreements or the benefit of collateral held 215 294  
Maximum credit exposure related to derivatives 9,072 18,226  
Reinsurance assets $ 47,712 $ 44,579  
Percentage ceded to reinsurers 91.00% 94.00%  
Exposure to credit risk $ 25,247 $ 25,466  
Net exposure after offsetting agreements and benefit of fair value of collateral held 22,465 19,113  
Fixed Surplus Note [Member]      
Disclosure of Risk Management [line items]      
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position 0 0  
Bottom of range [Member]      
Disclosure of Risk Management [line items]      
Global retention limit     $ 30
Top of range [Member]      
Disclosure of Risk Management [line items]      
Global retention limit     $ 35
Derivatives [Member]      
Disclosure of Risk Management [line items]      
Largest single counterparty exposure without master netting agreements or the benefit of collateral held 1,582 2,132  
Largest single counterparty exposure with master netting agreements or the benefit of collateral held $ 0 $ 0  
AA Credit Grades or Higher [Member]      
Disclosure of Risk Management [line items]      
Derivative exposure with counterparties, percentage 36.00% 17.00%  
Securities lending [Member]      
Disclosure of Risk Management [line items]      
Loaned securities included in invested assets $ 723 $ 564