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Risk Management - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of Risk Management [line items]      
Percentage of debt securities in investment grade with ratings ranging between AAA to BBB 97.00% 97.00%  
Percentage of total mortgage portfolio 14.00% 13.00%  
Loaned securities included in invested assets $ 20,280 $ 30,290  
Reverse repurchase transactions recorded as short-term receivables 1,490 716  
Repurchase transactions recorded as payables $ 536 353  
Term of credit default swaps 5 years    
Credit protection purchased $ 0 0  
Mitigated exposure to credit risk 10,121 16,696  
Largest single counterparty exposure without master netting agreements or the benefit of collateral held 8,593 13,243  
Largest single counterparty exposure with master netting agreements or the benefit of collateral held 294 120  
Maximum credit exposure related to derivatives 18,226 28,685  
Reinsurance assets $ 44,579 $ 45,836  
Percentage ceded to reinsurers 94.00% 94.00%  
Exposure to credit risk $ 25,466 $ 27,360  
Net exposure after offsetting agreements and benefit of fair value of collateral held 19,113 18,476  
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 2,132 4,110  
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 17.00% 20.00%  
Securities lending [Member]      
Disclosure of Risk Management [line items]      
Loaned securities included in invested assets $ 564 $ 889