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IFRS 7 Disclosures - Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders Arising from Changes to Public Equity Returns (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Interval percentage of which impact of rebalancing equity hedges for dynamically hedged variable annuity guarantee best estimate liabilities | 5.00% | 5.00%
10% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Percentage of changes in market values of publicly traded equities | 10.00% | 10.00%
20% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Percentage of changes in market values of publicly traded equities | 20.00% | 20.00%
30% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Percentage of changes in market values of publicly traded equities | 30.00% | 30.00%

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- Definition This percentage represents the interval size of which the impact of rebalancing equity hedges for dynamically hedged variable annuity guarantee best estimate liabilities. + References No definition available. + Details
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Data Type: | num:percentItemType
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Period Type: | duration

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- Definition Percentage of changes in market values of publicly traded equities. + References No definition available. + Details
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- Definition Schedule of potential immediate impact on net income attributed to shareholders arising from changes to public equity returns + References No definition available. + Details
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- Details
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- Details
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- Details
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