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ACCOUNTING POLICIES (Impairment) (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($)
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Discount rate used in current estimate of value in use |  | 11.28% |  |  |
Impairment charge (note 3 (f)) |  | $ 99,000 |  |  |
Interest rate risk |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Reasonably possible increase in risk variable, percent | 0.010 | 0.005 |  |  |
Reasonably possible decrease in risk variable, percent | 0.010 | 0.005 |  |  |
Steel Sales Volume Risk |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Reasonably possible increase in risk variable, percent |  | 0.050 |  |  |
Reasonably possible decrease in risk variable, percent |  | (0.050) |  |  |
Operating Income Before Amortization And Depreciation Risk Member |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Reasonably possible increase in risk variable, percent |  | 0.050 |  |  |
Reasonably possible decrease in risk variable, percent |  | (0.050) |  |  |
GDP Market Risk |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Reasonably possible increase in risk variable, percent | 0.005 |  |  |  |
Reasonably possible decrease in risk variable, percent | (0.005) |  |  |  |
Increase in value-in-use | 0.255 | 0.293 |  |  |
Decrease in value-in-use | (0.171) | 0.288 |  |  |
Steel, Iron Ore And Hard Coking Coal Prices |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Reasonably possible increase in risk variable, percent | 0.050 |  |  |  |
Reasonably possible decrease in risk variable, percent | (0.05) |  |  |  |
Usiminas Control Group |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Write Down Of Equity Method Investment |  | $ 120,400 |  |  |
Cash-generating units |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Growth rate used to extrapolate cash flow projections |  | 2.18% |  |  |
Discount rate used in current estimate of value in use |  | 11.28% | 9.93% |  |
Cash-generating units | Usiminas Control Group |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Discount rate used in current estimate of value in use | 13.50% |  |  |  |
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 | Cash-generating units |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Discount rate used in current estimate of value in use |  | 11.91% |  |  |
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%
Impairment charge (note 3 (f)) |  | $ 99,000 |  |  |
Recoverable amount of asset or cash-generating unit |  |  |  |  | $ 1,841,000

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