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8. INVESTMENTS (Details) - BRL (R$) R$ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 15, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Assets |  |  | R$ 50,869,276 | R$ 47,327,524 |  |
Shareholders' equity |  |  | 11,361,932 | 10,013,440 | R$ 8,288,229 | R$ 7,384,521
Profit (Loss) for the year |  | R$ 1,000,000 | 2,244,511 | 5,200,583 | R$ 111,229 |
Investments |  |  | R$ 3,584,169 | 5,630,613 |  |
Usiminas [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Shareholders' equity |  |  |  | R$ 2,250,623 |  |
Panatlantica S. A. ("Panatlantica") [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Direct equity interest, joint venture and joint operation |  |  | 11.31% | 11.33% |  |
Shareholders' equity |  |  | R$ 47,300 | R$ 28,566 |  |
Classified At Fair Value Through Profit Or Loss [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Shareholders' equity |  |  | 47,300 | 2,279,189 |  |
Other Investiments [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Shareholders' equity |  |  | 157 | 112 |  |
Profit (Loss) for the year |  |  | 171 | 2,316 |  |
Profit On Subsidiaries' Inventories [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Shareholders' equity |  |  | (18,563) | (116,375) |  |
Profit (Loss) for the year |  |  | 97,811 | (43,903) |  |
Others [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Shareholders' equity |  |  | 157 | 112 |  |
Profit (Loss) for the year |  |  | 171 | 2,316 |  |
Investiments in Affiliated Companies [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Shareholders' equity |  |  | 3,482,974 | 5,630,613 |  |
Classification Of Investiments In The Balance Sheet [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Profit (Loss) for the year |  |  | R$ 125,715 | 135,706 |  |
Arvedi Metalfer Do Brasil S.A. [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Associate name |  |  | Arvedi Metalfer do Brasil |  |  |
Assets |  |  | R$ 44,435 | 40,712 |  |
Liabilities |  |  | 31,712 | 26,308 |  |
Shareholders' equity |  |  | 12,723 | 14,404 |  |
Profit (Loss) for the year |  |  | (1,682) | (5,087) |  |
Associates [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Assets |  |  | 44,435 | 40,712 |  |
Liabilities |  |  | 31,712 | 26,308 |  |
Shareholders' equity |  |  | 12,723 | 14,404 |  |
Profit (Loss) for the year |  |  | R$ (1,682) | (5,087) |  |
MRS Logistica S.A. [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Joint venture and joint operation name |  |  | MRS Logística S.A. |  |  |
Assets |  |  | R$ 4,145,205 | 3,125,912 |  |
Liabilities |  |  | 2,616,218 | 1,693,200 |  |
Shareholders' equity |  |  | 1,528,987 | 1,432,712 |  |
Fair Value |  |  | 433,635 | 445,383 |  |
Profit (Loss) for the year |  |  | 187,597 | R$ 194,403 |  |
CBSI - Companhia Brasileira De Servicos De Infraestrutura [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Joint venture and joint operation name |  |  |  | CBSI - Companhia Brasileira de Serviços de Infraestrutura |  |
Assets |  |  |  | R$ 25,941 |  |
Liabilities |  |  |  | 19,997 |  |
Shareholders' equity |  |  |  | 5,944 |  |
Profit (Loss) for the year |  |  | 6,695 | 4,501 |  |
Joint-Venture And Joint-Operation [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Assets |  |  | 8,543,639 | 7,217,457 |  |
Liabilities |  |  | 5,825,596 | 4,597,048 |  |
Shareholders' equity |  |  | 2,718,043 | 2,620,409 |  |
Fair Value |  |  | 704,751 | 716,499 |  |
Profit (Loss) for the year |  |  | R$ 165,445 | 166,729 |  |
Transnordestina Logistica S.A [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Joint venture and joint operation name |  |  | Transnordestina Logística S.A. [Member] |  |  |
Assets | [1] |  | R$ 4,398,434 | 4,065,604 |  |
Liabilities | [1] |  | 3,209,378 | 2,883,851 |  |
Shareholders' equity | [1] |  | 1,189,056 | 1,181,753 |  |
Fair Value | [1] |  | 271,116 | 271,116 |  |
Profit (Loss) for the year | [1] |  | (17,100) | (20,429) |  |
MRS - Fair Value Amortization [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Profit (Loss) for the year |  |  | (11,747) | (11,746) |  |
Eliminations [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Profit (Loss) for the year |  |  | (38,219) | R$ (28,252) |  |
Investment Properties [Member] |  |  |  |  |  |
InvestmentsLineItems [Line Items] |  |  |  |  |  |
Shareholders' equity |  |  | R$ 101,195 |  |  |
[1] | As of December 31, 2019, and 2018, the Fair Value generated in the loss of control of Transnordestina Logistica S.A. is R$ 659,105 and impairment of R$ 387,989.

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