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Commitments and Contingencies - Additional Information (Detail) - CAD ($)
$ in Millions
 1 Months Ended
Sep. 18, 2023
Jun. 30, 2018
Dec. 31, 2023
Dec. 31, 2022
Disclosure of commitments and contingencies [line items]        
Investment commitments outstanding     $ 15,117 $ 14,193
Letters of credit outstanding     $ 466 215
Percentage of face amount of life insurance policies pending settlement     16.00%  
Percentage of face amount of life insurance policies settled 84.00%      
Aggregate percentage of lawsuits   100.00%    
The Manufacturers Life Insurance Company [Member] | Subordinated debentures due on December 15, 2041 [Member]        
Disclosure of commitments and contingencies [line items]        
Guaranteed payment of amounts on subordinated debenture     $ 650  
Mature in 30 Days [Member]        
Disclosure of commitments and contingencies [line items]        
Investment commitments outstanding     781 1,095
Less than 1 year [Member]        
Disclosure of commitments and contingencies [line items]        
Investment commitments outstanding     4,627 3,359
Mature after One year [Member]        
Disclosure of commitments and contingencies [line items]        
Investment commitments outstanding     $ 9,709 $ 9,739