Financial assets at fair value through profit or loss - Equity Instruments FVTPL (Parenthetical) (Detail) - Prisma Medios de Pago S.A. [Member]	12 Months Ended
Dec. 31, 2020 shares
Financial assets at fair value through profit or loss [line items]
Equity instruments number of shares held	10,805,542
Equity instruments percentage of shares held	5.44%

The proportion of the voting rights in an associate held by the entity. [Refer: Associates [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration