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Risk and Capital Management - Summary of Liquidity Indicators (Detail)
Dec. 31, 2019
Dec. 31, 2018
Disclosure of liquidity risk indicators [abstract]    
Net assets / customers funds within 30 days 62.40% 62.70%
Net assets / total customers funds 24.20% 24.60%
Net assets / total financial assets 16.60% 15.80%