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Derivative and Hedging Instruments - Additional Information (Detail) - CAD
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about hedges [Line Items]    
Notional amount CAD 336,773,000,000 CAD 370,198,000,000
Fair value of reinsurance ceded guaranteed minimum income benefits 1,079,000,000 1,408,000,000
Fair value of reinsurance assumed guaranteed minimum income benefits 100,000,000 119,000,000
Fair value of credit and interest rate embedded derivatives 123,000,000 218,000,000
Shareholders' accumulated other comprehensive income (loss) ("AOCI") [Member]    
Disclosure of detailed information about hedges [Line Items]    
Net loss that will be reclassified from AOCI to net income within next 12 months CAD 13,000,000  
Maximum time frame for which variable cash flows are hedged 19 years  
Variable annuity guarantee dynamic hedging and macro equity risk hedging programs [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount CAD 114,000,000,000 CAD 177,000,000,000