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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities $ 3,117 $ 3,288  
Amortized cost, gross of reinsurance ceded [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities 2,315 2,356 $ 2,315
Amortized cost, gross of reinsurance ceded [Member] | U.S. fixed annuity products [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities 1,380 1,361  
Amortized cost, gross of reinsurance ceded [Member] | Canadian fixed annuity products [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities 935 995  
Fair value [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities 2,618 2,766  
Fair value [Member] | U.S. fixed annuity products [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities 1,602 1,680  
Fair value [Member] | Canadian fixed annuity products [Member]      
Disclosure of Investment Contract Liabilities [line items]      
Investment contract liabilities $ 1,016 $ 1,086