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30 EVENTS AFTER THE REPORTING PERIOD (Details Narrative) - BRL (R$) R$ in Thousands |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 17, 2020 | Jan. 31, 2020 | Apr. 02, 2020 | Dec. 31, 2019
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Face amount |  |  |  | R$ 11,775,093
Event After Reporting Period [Member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Shares depreciated amount |  |  | R$ 999,900 |
Event After Reporting Period [Member] | CSN Resources S.A [Member] | Tender Offer [Member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Face amount | R$ 263,000,000 |  |  |
Borrowings, maturity | Maturity in 2020. |  |  |
Event After Reporting Period [Member] | Debt Securities [Member] | CSN Islands XI Corp [Member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Face amount |  | R$ 1,000,000 |  |
Borrowings, maturity |  | Maturity in 2028. |  |
Interest rate |  | 6.75% |  |

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