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14. FINANCIAL INSTRUMENTS (Details 3) - Dec. 31, 2020 € in Thousands, $ in Thousands | USD ($) | EUR (€)
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UNITED STATES [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Foreign exchange exposure | $ | $ 48,679 |
Euro [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Foreign exchange exposure | € |  | € 10,138
Foreign exchange risk [member] | UNITED STATES [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Foreign exchange exposure | $ | (3,876,521) |
Foreign exchange risk [member] | UNITED STATES [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | 3,992,200 |
Foreign exchange risk [member] | UNITED STATES [member] | Exchange rate swap CDI x dollar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | (67,000) |
Foreign exchange risk [member] | UNITED STATES [member] | Borrowings and financing [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | (4,812,268) |
Foreign exchange risk [member] | UNITED STATES [member] | Trade payables [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | (139,672) |
Foreign exchange risk [member] | UNITED STATES [member] | Other liabilities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | (9,305) |
Foreign exchange risk [member] | UNITED STATES [member] | Total liabilities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | (4,961,417) |
Foreign exchange risk [member] | UNITED STATES [member] | Iron ore derivative [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | (172) |
Foreign exchange risk [member] | UNITED STATES [member] | Cash and cash equivalents overseas [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | 664,951 |
Foreign exchange risk [member] | UNITED STATES [member] | Trade receivables [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | 387,039 |
Foreign exchange risk [member] | UNITED STATES [member] | Other assets [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | 9,158 |
Foreign exchange risk [member] | UNITED STATES [member] | Total assets [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | 1,084,896 |
Foreign exchange risk [member] | UNITED STATES [member] | Financial investments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | $ | $ 23,748 |
Foreign exchange risk [member] | Euro [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Foreign exchange exposure | € |  | 10,138
Foreign exchange risk [member] | Euro [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  |
Foreign exchange risk [member] | Euro [member] | Exchange rate swap CDI x dollar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  |
Foreign exchange risk [member] | Euro [member] | Borrowings and financing [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  |
Foreign exchange risk [member] | Euro [member] | Trade payables [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  | (9,258)
Foreign exchange risk [member] | Euro [member] | Other liabilities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  | (1,010)
Foreign exchange risk [member] | Euro [member] | Total liabilities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  | (10,268)
Foreign exchange risk [member] | Euro [member] | Iron ore derivative [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  |
Foreign exchange risk [member] | Euro [member] | Cash and cash equivalents overseas [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  | 13,372
Foreign exchange risk [member] | Euro [member] | Trade receivables [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  | 2,560
Foreign exchange risk [member] | Euro [member] | Other assets [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  | 4,474
Foreign exchange risk [member] | Euro [member] | Total assets [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  | 20,406
Foreign exchange risk [member] | Euro [member] | Financial investments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net foreign exchange exposure | € |  |

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