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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities $ 3,248 $ 3,117  
Amortized cost, gross of reinsurance ceded [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities 2,452 2,315 $ 2,356
Amortized cost, gross of reinsurance ceded [Member] | U.S. fixed annuity products [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities 1,575 1,380  
Amortized cost, gross of reinsurance ceded [Member] | Canadian fixed annuity products [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities 877 935  
Fair value [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities 2,503 2,618  
Fair value [Member] | U.S. fixed annuity products [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities 1,547 1,602  
Fair value [Member] | Canadian fixed annuity products [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities $ 956 $ 1,016