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10. BASIS OF CONSOLIDATION AND INVESTMENTS IN SUBSIDIARIES AND AFFILIATES (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Assets R$ 63,002,149 R$ 50,869,276    
Liabilities 344,488 419,894    
Shareholders' equity 11,251,505 11,361,932 R$ 10,013,440 R$ 8,288,229
Profit /(Loss) for the period 4,292,618 2,244,511 R$ 5,200,583  
Panatlantica [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Shareholders' equity 59,879 47,300    
Classified at fair value through profit or loss [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Shareholders' equity 59,879 47,300    
Eliminations [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Profit /(Loss) for the period (30,856) (38,219)    
Other [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Shareholders' equity 279 157    
Profit /(Loss) for the period (9,967) 171    
Total Other Investment [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Shareholders' equity 279 157    
Profit /(Loss) for the period (9,967) 171    
Total investments in affillated companies [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Shareholders' equity 3,535,906 3,484,974    
Total Equity in results of affillated companies [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Profit /(Loss) for the period 71,755 125,715    
Investments properties [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Shareholders' equity 159,874 101,195    
Total investments [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Shareholders' equity 3,695,780 3,584,169    
Arvedi Metalfer do Brasil S.A. [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Assets 40,528 44,435    
Liabilities 32,490 31,712    
Shareholders' equity 8,038 12,723    
Profit /(Loss) for the period (6,765) (1,682)    
Associates [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Assets 40,528 44,435    
Liabilities 32,490 31,712    
Shareholders' equity 8,038 12,723    
Profit /(Loss) for the period (6,765) (1,682)    
Equimac S.A [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Profit /(Loss) for the period (329)      
MRS Logistica S.A. [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Assets 4,175,249 4,145,205    
Liabilities 2,567,882 2,616,218    
Shareholders' equity 1,607,367 1,528,987    
Profit /(Loss) for the period 160,371 187,597    
Fair Value - MRS Logistica S.A. [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Shareholders' equity 421,888 433,635    
Profit /(Loss) for the period (11,747) (11,747)    
CSBI - Companhia Brasileira de Servicos de Infraestrutura [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Assets      
Liabilities      
Profit /(Loss) for the period   6,665    
Transnordestina logistica s.a [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Assets 4,657,691 4,398,434    
Liabilities 3,497,587 3,209,378    
Shareholders' equity 1,160,104 1,189,056    
Profit /(Loss) for the period (28,952) (17,100)    
Fair Value - Transnordestina [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Assets    
Liabilities      
Shareholders' equity 271,116 271,116    
Profit /(Loss) for the period    
Equimac S.A [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Assets 7,536      
Liabilities 301      
Shareholders' equity 7,235      
Joint-venture and Joint-operation [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Assets 8,840,476 8,543,639    
Liabilities 6,065,770 5,825,596    
Shareholders' equity 3,467,710 3,422,794    
Profit /(Loss) for the period 119,343 165,415    
Equimac S.A [member]        
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]        
Assets 15,072      
Liabilities      
Shareholders' equity R$ 14,470      
Profit /(Loss) for the period