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13. ACCOUNTS RECEIVABLE FROM THE STATE OF MINAS GERAIS (Details Narrative) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of accounts receivables [abstract]    
Description of payment from state of minas gerais 12 consecutive monthly installments  
Amounts received from minas gerais state government R$ 148
Remaining amounts receivable from recognized in non current assets R$ 115 R$ 246