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IFRS 7 Disclosures - Summary of Risk Management Strategies (Detail)
 12 Months Ended
Dec. 31, 2017
Publicly Traded Equity Performance Risk [Member]  
Disclosure of risk management strategy [Line Items]  
Product design and pricing Yes
Variable annuity guarantee dynamic hedging Yes
Macro equity risk hedging Yes
Asset liability management Yes
Foreign exchange management No
Interest Rate and Spread Risk [Member]  
Disclosure of risk management strategy [Line Items]  
Product design and pricing Yes
Variable annuity guarantee dynamic hedging Yes
Macro equity risk hedging No
Asset liability management Yes
Foreign exchange management No
Alternative Long-Duration Asset Performance Risk [Member]  
Disclosure of risk management strategy [Line Items]  
Product design and pricing Yes
Variable annuity guarantee dynamic hedging No
Macro equity risk hedging No
Asset liability management Yes
Foreign exchange management No
Foreign Exchange Risk [Member]  
Disclosure of risk management strategy [Line Items]  
Product design and pricing Yes
Variable annuity guarantee dynamic hedging Yes
Macro equity risk hedging Yes
Asset liability management Yes
Foreign exchange management Yes