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Accounts Receivable from The State of Minas Gerais - Additional Information (Detail)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
BRL (R$)
Disclosure of accounts receivables [abstract]  
Reimburse from minas gerais state government R$ 281
Historical amount from minas gerais state government 239
Monetary adjustment from minas gerais state government R$ 42
Payment description from Minas Gerais state government 12 consecutive monthly installments
Amounts Received from Minas Gerais state government R$ 46
Remaining amounts receivable from Minas Gerais state government R$ 235