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, 2019 shares
Financial assets at fair value through profit or loss [line items]
Equity instruments number of shares held	2,252,139
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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-IssueDate 2019-01-01
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration