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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Shareholder claims, Mexican income tax adjustment & Argentine tax claim) (Details) shares in Millions, $ in Millions, R$ in Billions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Apr. 14, 2015 shares | Dec. 31, 2016 BRL (R$)
Comissão de Valores Mobiliários | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Number of shares exceeding threshold for tender offer requirement (in shares) | shares |  | 5.2 |
Increase in capital | R$ |  |  | R$ 1
Domestic Tax Authority | Mexican Tax Authority |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Tax contingent liability | $ 56.4 |  |
Additional tax contingent liability | $ 27.6 |  |

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