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11 BORROWINGS, FINANCING AND DEBENTURES (Details) - BRL (R$)
R$ in Thousands

12 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Disclosure of detailed information about borrowings [line items]

Borrowings and financing, current

R$ 5,152,234

R$ 5,681,797

Borrowings and financing, noncurrent

22,938,469

23,260,944

Transaction costs and issue premiums, current

(26,391)

(28,358)

Transaction costs and issue premiums, noncurrent

(97,276)

(87,309)

Borrowings and financing and transaction costs, current

5,125,843

5,653,439

Borrowings and financing and transaction costs, noncurrent

22,841,193

23,173,635

Foreign Currency [Member]

Disclosure of detailed information about borrowings [line items]

Borrowings and financing, current

4,040,211

3,687,971

Borrowings and financing, noncurrent

12,888,686

12,550,266

Local Currency [Member]

Disclosure of detailed information about borrowings [line items]

Borrowings and financing, current

1,112,023

1,993,826

Borrowings and financing, noncurrent

10,049,783

10,710,678

Variable Interest [Member] | Prepayment [Member] | Foreign Currency [Member] | United States of America, Dollars

Disclosure of detailed information about borrowings [line items]

Borrowings and financing, current

1,769,975

1,016,737

Borrowings and financing, noncurrent

2,563,928

3,830,240

Variable Interest [Member] | BNDES/FINAME, Debentures, NCE and CCB [Member]

Disclosure of detailed information about borrowings [line items]

Borrowings and financing, current

^[1]

1,086,985

1,890,450

Borrowings and financing, noncurrent

^[1]

10,049,783

10,710,678

Fixed Interest [Member] | Prepayment [Member]

Disclosure of detailed information about borrowings [line items]

Borrowings and financing, noncurrent

103,376

Fixed Interest [Member] | Bonds, Perpetual Bonds and ACC [Member] | Foreign Currency [Member] | United States of America, Dollars

Disclosure of detailed information about borrowings [line items]

Borrowings and financing, current

^[2]

2,047,032

2,490,178

Borrowings and financing, noncurrent

^[2]

10,177,517

8,613,491

Fixed Interest [Member] | Others [Member] | Foreign Currency [Member] | Euro Member Countries, Euro

Disclosure of detailed information about borrowings [line items]

Borrowings and financing, current

223,204

181,056

Borrowings and financing, noncurrent

147,241

R$ 106,535

Fixed Interest [Member] | Intercompany [Member]

Disclosure of detailed information about borrowings [line items]

Borrowings and financing, current

R$ 25,038

[1]

In January 2019, the Company issued debt securities in the domestic market (''Debentures''), in the amount of R$ 1,950 million, with maturity in 2023 and interest of 126,8% of CDI.

[2]

In April 2019, the Company issued debt securities in the foreign market (''Bonds''), through its subsidiary CSN Resources S.A., in the amount of US$ 1 billion, being US$ 400 million with maturity in February 2023 and US$600 million with maturity in April 2026, both with interest of 7.625% per annum. Between April and May 2019, a tender offer (''Tender Offer'') of the Notes was issued by CSN Islands XI Corp. and CSN Resources S.A., subsidiaries of the Company, having repurchased US$ 1 billion in bonds with maturity in 2019 and 2020. In July 2019, the Company issued thought to its subsidiary CSN Resources, debt securities in the foreign market (''Bonds''), in the amount of US$ 175million, with maturity in February 2023 and interest of 7.625% per annum and made the final payment of the debt in the foreign market (''Notes''), issued by the company CSN Islands XI Corp in September 2019 in the amount of US$ 142 million.

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