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v3.19.1

CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Shareholder claims, Mexican income tax adjustment & Argentine tax claim) (Details) shares in Millions, $ in Millions, $ in Billions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Apr. 14, 2015 shares | Sep. 30, 2018 USD ($) | Dec. 31, 2016 ARS ($)
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 | shares |  | 5.2 |  |
Increase in capital |  |  |  | $ 1
Domestic Tax Authority | Mexican Tax Authority |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Tax contingent liability | $ 57.8 |  |  |
Additional tax contingent liability |  |  | $ 25.4 |

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