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IFRS 7 Disclosures - Summary of Potential Impact on Net Income Attributed to Shareholders Arising from Changes to Spreads (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Corporate spreads [Member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [Line Items]    
Spreads period assumed to grade to long-term average 5 years 5 years