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15. CONCESSION CONTRACT ASSETS (Details 2) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
ConcessionContractAssetsLineItems [Line Items]      
Current consideration R$ 737    
Non current consideration 3,008    
Total consideration 3,745    
Restated [member]      
ConcessionContractAssetsLineItems [Line Items]      
Current consideration   R$ 576 R$ 482
Non current consideration   2,500 2,427
Total consideration   3,076 2,909
Concession contract - 004/05 [member]      
ConcessionContractAssetsLineItems [Line Items]      
Current consideration 19    
Non current consideration 91    
Concession contract - 004/05 [member] | Restated [member]      
ConcessionContractAssetsLineItems [Line Items]      
Current consideration  
Non current consideration  
Concession contract - 079/00 [member]      
ConcessionContractAssetsLineItems [Line Items]      
Current consideration 29    
Non current consideration 133    
Concession contract - 079/00 [member] | Restated [member]      
ConcessionContractAssetsLineItems [Line Items]      
Current consideration   21 19
Non current consideration   95 93
Basic Network of the Existing System (BNES) [member]      
ConcessionContractAssetsLineItems [Line Items]      
Current consideration 533    
Non current consideration 1,363    
Basic Network of the Existing System (BNES) [member] | Restated [member]      
ConcessionContractAssetsLineItems [Line Items]      
Current consideration   434 347
Non current consideration   1,494 1,714
Basic Network of New Facilities (BNNF) [member]      
ConcessionContractAssetsLineItems [Line Items]      
Current consideration 156    
Non current consideration R$ 1,421    
Basic Network of New Facilities (BNNF) [member] | Restated [member]      
ConcessionContractAssetsLineItems [Line Items]      
Current consideration   121 116
Non current consideration   R$ 911 R$ 620