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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, 2021
Dec. 31, 2020
Disclosure of detailed information about investment property [abstract]    
Rental income from investment properties $ 837 $ 874
Direct operating expenses of rental investment properties (464) (491)
Total $ 373 $ 383