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17. PROVISION FOR TAX, SOCIAL SECURITY, LABOR, CIVIL AND ENVIRONMENTAL RISKS AND JUDICIAL DEPOSITS (Details 2) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | R$ 31,612,488 | R$ 30,639,075
Tax assessment notice issued against the Company for an alleged sale of 40% of the shares of its joint venture NAMISA to a Japanese-Korean consortium |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 11,812,071 | 11,073,961
Income tax / Social contribution - Assessment Notice and Imposition of Fine (AIIM) - Disallowance of deductions of goodwill generated in the reverse incorporation of Big Jump by Namisa |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 3,722,888 | 2,623,179
Assessment Notice and Imposition of Fine (AIIM) - Income tax / Social contribution - gloss of interest on prepayment arising from supply contracts of iron ore and port services |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 2,165,088 | 2,500,606
Assessment Notice and Imposition of Fine (AIIM) - Income tax / Social contribution - Due to profits from foreign subsidiaries (years 2008, 2010 and 2011) |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 1,891,149 | 1,858,640
Tax foreclosures - ICMS - Electricity credits |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 974,479 | 920,306
Installments MP 470 - alleged insufficiency of tax losses |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss |  | 704,739
Offset of taxes that were not approved by the Federal Revenue Service - IRPJ/CSLL, PIS/COFINS e IPI |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 1,481,382 | 1,685,648
Disallowance of the ICMS credits - Transfer of iron ore |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 529,607 | 499,006
ICMS - Refers to the transfer of imported raw material at an amount lower than the price disclosed in the import documentation |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 294,527 | 275,233
Disallowance of the tax losses arising on adjustments to the SAPLI |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 516,583 | 491,862
Assessment Notice - ICMS - shipping and return merchandise for Industrialization |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss |  | 816,199
Assessment Notice- Income tax- Capital Gain of CFM vendors located outside |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 243,007 | 203,185
CFEM - Divergence on the understanding between CSN and DNPM on the calculation basis |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 311,582 | 290,249
Other tax (federal, state, and municipal) lawsuits |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 976,438 | 3,065,131
Assessment Notice - ICMS - Questions about sales to incentive zone |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 3,625,167 | 170,330
Social security lawsuits |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 287,823 | 278,600
Annulment action filed by CSN against CADE |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 101,683 | 98,189
Other civil lawsuits |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 922,171 | 1,111,944
Labor and social security lawsuits |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 1,537,078 | 1,569,712
Environmental lawsuits - ACP TAC/PAC - Compliance with environmental obligations |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss |  | 216,878
Tax foreclosures - Fine of Volta Grande IV (2) |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | 75,530 | 67,620
Others Environmental lawsuits |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Legal matters with possible risk of loss | R$ 144,235 | R$ 117,858

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