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14. FINANCIAL INSTRUMENTS (Details 3) - Dec. 31, 2020
€ in Thousands, $ in Thousands
USD ($)
EUR (€)
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 | €