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Invested Assets and Investment Income - Summary of Rental Income of Investment Properties (Detail) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about investment property [abstract]    
Rental income from investment properties CAD 1,120 CAD 1,204
Direct operating expenses of investment properties that generated rental income (694) (764)
Total CAD 426 CAD 440