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Provisions - Changes in Provisions (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Changes In The Provisions [Line Items]    
PROVISIONS $ 7,234,088 $ 3,577,276
Increases 4,520,836 6,871,516
Provisions reversals (675,173)  
Provisions used (3,070,743) (3,214,704)
Inflation adjustment (1,981,407)  
PROVISIONS 6,027,601 7,234,088
Other provisions [member]    
Disclosure Of Changes In The Provisions [Line Items]    
PROVISIONS 3,310,543 2,826,834
Increases 1,124,419 3,200,103
Provisions reversals (28,587)  
Provisions used (742,649) (2,716,394)
Inflation adjustment (1,029,881)  
PROVISIONS 2,633,845 3,310,543
Provision for Commercial Claims [member]    
Disclosure Of Changes In The Provisions [Line Items]    
PROVISIONS 2,605,366 2,251,611
Increases 750,096 2,648,272
Provisions used (630,636) (2,294,517)
Inflation adjustment (766,894)  
PROVISIONS 1,957,932 2,605,366
Provisions labor-related [member]    
Disclosure Of Changes In The Provisions [Line Items]    
PROVISIONS 278,001 354,470
Increases 139,933 175,162
Provisions used (72,920) (251,631)
Inflation adjustment (94,110)  
PROVISIONS 250,904 278,001
Provisions tax claims [member]    
Disclosure Of Changes In The Provisions [Line Items]    
PROVISIONS 143,757 146,001
Increases 119,771 92,895
Provisions used (26,773) (95,139)
Inflation adjustment (53,804)  
PROVISIONS 182,951 143,757
Others [member]    
Disclosure Of Changes In The Provisions [Line Items]    
PROVISIONS 283,419 74,752
Increases 114,619 283,774
Provisions reversals (28,587)  
Provisions used (12,320) (75,107)
Inflation adjustment (115,073)  
PROVISIONS 242,058 283,419
Provisions for reorganization [member]    
Disclosure Of Changes In The Provisions [Line Items]    
PROVISIONS 2,690,285  
Increases 2,858,723 3,188,547
Provisions reversals (646,586)  
Provisions used (2,328,094) (498,262)
Inflation adjustment (545,166)  
PROVISIONS 2,029,162 2,690,285
Financial guarantees and loan commitments [member]    
Disclosure Of Changes In The Provisions [Line Items]    
PROVISIONS 1,233,260 750,442
Increases 537,694 482,866
Provisions used   (48)
Inflation adjustment (406,360)  
PROVISIONS $ 1,364,594 $ 1,233,260