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Employee Benefit Plans and Similar Obligations - Summary of Share Based Compensation Plan (Plan 2018-2021) (Detail) - Plan 2018-21 [member]
$ in Millions
 12 Months Ended
Dec. 31, 2020
ARS ($)
Dec. 31, 2020
$ / shares
Dec. 31, 2019
ARS ($)
Dec. 31, 2019
$ / shares
Dec. 31, 2018
ARS ($)
Dec. 31, 2018
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Amount at the beginning of the fiscal year 508,458   761,512      
- Granted         761,512  
Settled (246,457)   (246,987)      
- Expired (24,919)   (6,067)      
Amount at end of fiscal year 237,082   508,458   761,512  
Expense recognized during the fiscal year | $ $ 127   $ 212   $ 100  
Fair value of shares on grant date (in U.S. dollars) | $ / shares   $ 13.60   $ 13.60   $ 13.60