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Invested Assets and Investment Income - Summary of Rental Income of Investment Properties (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about investment property [abstract]    
Rental income from investment properties $ 825 $ 837
Direct operating expenses of rental investment properties (458) (464)
Total $ 367 $ 373