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Employee Benefit Plans and Similar Obligations - Additional Information (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Repurchase of own shares issued, shares 737,378 411,623 250,795
Repurchase of own shares issued, value $ 550 $ 280 $ 120
Plan 2015-18 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2015    
Amount charged to expense in relation with share-based plans     12
Plan 2016-19 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2016    
Amount charged to expense in relation with share-based plans   21 54
Plan 2017-20 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2017    
Amount charged to expense in relation with share-based plans $ 37 98 142
Plan 2018-21 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2018    
Amount charged to expense in relation with share-based plans $ 127 212 100
Plan 2019-22 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2019    
Amount charged to expense in relation with share-based plans $ 293 189  
Plan 2020-23 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2020    
Share-based Plans [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Amount charged to expense in relation with share-based plans $ 541 $ 493 $ 308
Number of shares delivered under plan 769,312 609,910 538,252
Retirement Plan [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Total charges $ 211 $ 133 $ 87
Performance Bonus Programs and Performance Evaluation [Member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Total charges $ 4,231 $ 3,790 $ 2,141