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ACCOUNTING POLICIES (Impairment) (Details)	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020
Disclosure of impairment loss and reversal of impairment loss [line items]
Discount rate used in current estimate of value in use	9.93%
Usiminas Control Group
Disclosure of impairment loss and reversal of impairment loss [line items]
Discount rate used in current estimate of value in use	11.95%
Cash-generating units
Disclosure of impairment loss and reversal of impairment loss [line items]
Growth rate used to extrapolate cash flow projections	2.30%
Discount rate used in current estimate of value in use	9.93%	8.87%
Argentina | Subsidiaries
Disclosure of impairment loss and reversal of impairment loss [line items]
Discount rate used in current estimate of value in use			14.30%
Brazil | Subsidiaries
Disclosure of impairment loss and reversal of impairment loss [line items]
Discount rate used in current estimate of value in use			10.30%

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- Definition

The discount rate used in the current estimate of the present value of the future cash flows expected to be derived from an asset or cash-generating unit.

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

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