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SUBSEQUENT EVENTS - Agreement Regarding Governance of Usiminas (Details) - Previdência Usiminas - Tenrium Investments S.a r.l. & Nippon Steel & Sumitomo Metal Corporation	Feb. 08, 2018 term
Disclosure of non-adjusting events after reporting period [line items]
Alternating time interval to nominate CEO	4 years
Number of consecutive terms	2
Alternating term to nominate CEO	2 years

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

Alternating term to nominate CEO

+ References

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- Definition

Alternating time interval to nominate CEO

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No definition available.

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- Definition

Number of Consecutive Terms

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