Income Tax - Summary of Breakdown of Deferred Tax (Parenthetical) (Detail) $ in Millions	12 Months Ended
Dec. 31, 2018 ARS ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Adjustment for inflation of the opening deferred liabilities	$ (3,432)
IFRS9 [member] \| Financial assets impaired [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Impairment of financial assets	$ 127

The amount of impairment loss on financial assets. [Refer: Financial assets; Impairment loss]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 20
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_20_e&doctype=Standard&book=b
-URIDate 2018-03-16

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration