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INCOME TAX AND DEFERRED TAX, Component of Net Deferred Tax Assets and Liabilities (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year $ (6,483,714)  
Deferred tax assets (liability), end of year (7,448,592) $ (6,483,714)
Deferred Tax Assets [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 1,728,787 1,736,422
Charge in results (106,117) (7,635)
Deferred tax assets (liability), end of year 1,622,670 1,728,787
Deferred Tax Assets [Member] | Other Receivables [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 0 0
Charge in results 13,517 0
Deferred tax assets (liability), end of year 13,517 0
Deferred Tax Assets [Member] | Allowance for Doubtful Accounts [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 995 0
Charge in results (995) 995
Deferred tax assets (liability), end of year 0 995
Deferred Tax Assets [Member] | Tax Credits Discounted Value Loss [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 484 811
Charge in results (484) (327)
Deferred tax assets (liability), end of year 0 484
Deferred Tax Assets [Member] | Account Receivables Discounted Value [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 995 4,761
Charge in results (352) (3,766)
Deferred tax assets (liability), end of year 643 995
Deferred Tax Assets [Member] | Provisions for Legal Claims and Other Provisions [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 210,815 211,326
Charge in results 12,320 (511)
Deferred tax assets (liability), end of year 223,135 210,815
Deferred Tax Assets [Member] | Financial Lease [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 817,211 853,576
Charge in results (89,081) (36,365)
Deferred tax assets (liability), end of year 728,130 817,211
Deferred Tax Assets [Member] | Contract liabilities [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 686,267 665,948
Charge in results (46,704) 20,319
Deferred tax assets (liability), end of year 639,563 686,267
Deferred Tax Assets [Member] | Tax Loss Carryforward [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 0 0
Charge in results 944 0
Deferred tax assets (liability), end of year 944 0
Deferred Tax Assets [Member] | Tax Inflation Adjustment [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 12,020 0
Charge in results 4,718 12,020
Deferred tax assets (liability), end of year 16,738 12,020
Deferred Tax Liabilities [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year (8,212,501) (6,393,198)
Charge in results (858,761) (1,819,303)
Deferred tax assets (liability), end of year (9,071,262) (8,212,501)
Deferred Tax Liabilities [Member] | Tax Inflation Adjustment [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year (2,223,023) 0
Charge in results (1,365,008) (2,223,023)
Deferred tax assets (liability), end of year (3,588,031) (2,223,023)
Deferred Tax Liabilities [Member] | Deferred Sales [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year 0 5,945
Charge in results 0 (5,945)
Deferred tax assets (liability), end of year 0 0
Deferred Tax Liabilities [Member] | Loans [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year (35,759) (65,093)
Charge in results 15,815 29,334
Deferred tax assets (liability), end of year (19,944) (35,759)
Deferred Tax Liabilities [Member] | Property, Plant and Equipment [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year (5,920,872) (6,111,056)
Charge in results 693,689 190,184
Deferred tax assets (liability), end of year (5,227,183) (5,920,872)
Deferred Tax Liabilities [Member] | Cash and Cash Equivalents [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year (2,897) (198,776)
Charge in results 1,861 195,879
Deferred tax assets (liability), end of year (1,036) (2,897)
Deferred Tax Liabilities [Member] | Inventories [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year (27,412) (24,218)
Charge in results (6,112) (3,194)
Deferred tax assets (liability), end of year (33,524) (27,412)
Deferred Tax Liabilities [Member] | Other Financial Assets at Amortized Cost [Member]    
Components of Net Deferred Tax Assets and Liabilities [abstract]    
Deferred tax assets (liability), beginning of year (2,538) 0
Charge in results (199,006) (2,538)
Deferred tax assets (liability), end of year $ (201,544) $ (2,538)