Income Tax - Summary of Breakdown of Deferred Tax (Parenthetical) (Detail) - ARS ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Breakdown of deferred tax [line Items]
Adjustment for inflation of the opening deferred liabilities of subsidiaries with the Peso as functional currency	$ (1,957)	$ (1,523)	$ (3,432)
IFRS9 [member] \| Financial assets impaired [member]
Breakdown of deferred tax [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 2020-01-01
-Paragraph 20
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_20_e&doctype=Standard&book=b
-URIDate 2020-01-01

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration