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Investment Contract Liabilities - Summary of Investment Contract Liabilities Measured at Amortized Cost and Fair Value Associated with Contracts (Parenthetical) (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Investment Contract Liabilities [line items]    
Investment contract liabilities reinsured $ 38 $ 48
Investment contract liabilities 3,248 3,117
Carrying amount [member]    
Disclosure of Investment Contract Liabilities [line items]    
Investment contract liabilities reinsured 38 48
Investment contract liabilities 2,414 2,267
Fair value [Member]    
Disclosure of Investment Contract Liabilities [line items]    
Investment contract liabilities reinsured 38 52
Investment contract liabilities $ 2,465 $ 2,566