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34. SUBSEQUENT EVENTS (Details Narrative) R$ / shares in Units, R$ in Thousands, $ in Thousands | Feb. 22, 2021 BRL (R$) | Feb. 17, 2021 BRL (R$) R$ / shares shares | Jan. 31, 2021 USD ($) shares | Jan. 31, 2021 BRL (R$) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2020 BRL (R$) | Dec. 31, 2019 BRL (R$)
--- | --- | --- | --- | --- | --- | --- | ---
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Statutory reserve |  |  |  |  |  | R$ 32,720 | R$ 32,720
Debt |  |  |  |  |  | R$ 35,370,611 |
USD |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Debt | $ |  |  |  |  | $ 24,901,552 |  |
Event after reporting period [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Statutory reserve | R$ 1,500,000 |  |  |  |  |  |
Increase in the capital | R$ 6,040,000 |  |  |  |  |  |
Event after reporting period [member] | CSN Mineracao SA [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Share capital |  | R$ 5,430,057,060 |  |  |  |  |
Ratio of share split |  | 01:30 |  |  |  |  |
Event after reporting period [member] | CSN Mineracao SA [member] | Primary Distribution [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Number of share issued | shares |  | 161,189,078 |  |  |  |  |
Number of share issued, value |  | R$ 1,370,000 |  |  |  |  |
Share price (in R$ per share) | R$ / shares |  | R$ 8.50 |  |  |  |  |
Event after reporting period [member] | CSN Mineracao SA [member] | Secondary Distribution [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Number of share issued | shares |  | 372,749,743 |  |  |  |  |
Number of share issued, value |  | R$ 2,785,000 |  |  |  |  |
Share price (in R$ per share) | R$ / shares |  | R$ 8.50 |  |  |  |  |
Event after reporting period [member] | CSN Mineracao SA [member] | Top of range [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Percentage of additional shares held by the current shareholders |  | 20.00% |  |  |  |  |
Percentage of additional shares held by the majority shareholder |  | 15.00% |  |  |  |  |
Event after reporting period [member] | NCEs [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Debt amortized |  |  |  | R$ 315,000 |  |  |
Event after reporting period [member] | Export prepayment contracts [member] | USD |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Debt | $ |  |  | $ 265,000 |  |  |  |
Debt maturity year |  |  | 2022 | 2022 |  |  |
Debt reprofiling | $ |  |  | $ 79,000 |  |  |  |
Debt maturity year postponed |  |  | 2023 | 2023 |  |  |
Event after reporting period [member] | Debentures [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Buy back of debentures, shares | shares |  |  | 450,000 | 450,000 |  |  |
Buy back of debentures, value |  |  |  | R$ 391,000 |  |  |
Percentage of buy back of debentures |  |  | 23.00% | 23.00% |  |  |

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