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Employee Benefit Plans and Similar Obligations - Summary of Share Based Compensation Plan (Plan 2017-2020) (Detail) - Plan 2017-2020 [member]
$ in Millions
 12 Months Ended
Dec. 31, 2020
ARS ($)
Dec. 31, 2020
$ / shares
Dec. 31, 2019
ARS ($)
Dec. 31, 2019
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Amount at the beginning of the fiscal year 183,201   375,552  
Settled (179,160)   (182,445)  
- Expired (4,041)   (9,906)  
Amount at the end of the fiscal year     183,201  
Expense recognized during the fiscal year | $ $ 37   $ 98  
Fair value of shares on grant date (in U.S.dollars) | $ / shares   $ 20.26   $ 20.26