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Investment Contract Liabilities - Summary of Investment Contract Liabilities Measured at Amortized Cost and Fair Value Associated with Contracts (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities $ 11,816 $ 10,079 $ 10,064  
Amortized cost, gross of reinsurance ceded [Member]        
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities 11,067 9,281   $ 9,239
Amortized cost, gross of reinsurance ceded [Member] | Asia [Member]        
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities 451 636    
Amortized cost, gross of reinsurance ceded [Member] | Canada [member]        
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities 7,642 6,699    
Amortized cost, gross of reinsurance ceded [Member] | U.S. [member]        
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities 1,381 1,535    
Amortized cost, gross of reinsurance ceded [Member] | GWAM [member]        
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities 1,593 411    
Fair value [Member]        
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities 10,994 9,034    
Fair value [Member] | Asia [Member]        
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities 438 607    
Fair value [Member] | Canada [member]        
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities 7,534 6,474    
Fair value [Member] | U.S. [member]        
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities 1,440 1,571    
Fair value [Member] | GWAM [member]        
Disclosure of Investment Contract Liabilities [line items]        
Investment contract liabilities $ 1,582 $ 382