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14. FINANCIAL INSTRUMENTS (Details 11) - Foreign exchange risk [member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Numnber
Disclosure of detailed information about financial instruments [line items]  
Designated amounts R$ 120,000
Cash flow hedges [member]  
Disclosure of detailed information about financial instruments [line items]  
Designated amounts 5,828,806
Amortized part (1,836,606)
Effect on Result (1,667,886) [1]
Impact on Shareholders' equity R$ (5,125,058)
Cash flow hedges [member] | Export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 12/18/2014
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  May 2020 
Exchange rate on designation | Numnber 2.6805
Designated amounts R$ 30,000
Amortized part (30,000)
Effect on Result (82,374) [1]
Impact on Shareholders' equity
Cash flow hedges [member] | Export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 12/18/2014
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  May 2020 
Exchange rate on designation | Numnber 2.678
Designated amounts R$ 35,000
Amortized part (35,000)
Effect on Result (96,190) [1]
Impact on Shareholders' equity
Cash flow hedges [member] | Export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 12/18/2014
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  May 2020 
Exchange rate on designation | Numnber 2.676
Designated amounts R$ 35,000
Amortized part (35,000)
Effect on Result (96,261) [1]
Impact on Shareholders' equity
Cash flow hedges [member] | Export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 7/21/2015
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  July 2019 - March 2021 
Exchange rate on designation | Numnber 3.1813
Designated amounts R$ 60,000
Amortized part (45,000)
Effect on Result (58,475) [1]
Impact on Shareholders' equity R$ (30,231)
Cash flow hedges [member] | Export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 7/23/2015
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  July 2019 - March 2021 
Exchange rate on designation | Numnber 3.285
Designated amounts R$ 100,000
Amortized part (75,000)
Effect on Result (92,026) [1]
Impact on Shareholders' equity R$ (47,793)
Cash flow hedges [member] | Export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 7/23/2015
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  August 2018 - October 2022 
Exchange rate on designation | Numnber 3.285
Designated amounts R$ 30,000
Amortized part (18,000)
Effect on Result (14,185) [1]
Impact on Shareholders' equity R$ (22,940)
Cash flow hedges [member] | Export pepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 7/24/2015
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  August 2018 - October 2022 
Exchange rate on designation | Numnber 3.3254
Designated amounts R$ 100,000
Amortized part (60,000)
Effect on Result (46,474) [1]
Impact on Shareholders' equity R$ (74,852)
Cash flow hedges [member] | Export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 7/27/2015
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  August 2018 - October 2022 
Exchange rate on designation | Numnber 3.3557
Designated amounts R$ 25,000
Amortized part (15,000)
Effect on Result (11,467) [1]
Impact on Shareholders' equity R$ (18,410)
Cash flow hedges [member] | Export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 7/27/2015
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  August 2018 - October 2022 
Exchange rate on designation | Numnber 3.3557
Designated amounts R$ 70,000
Amortized part (42,000)
Effect on Result (32,108) [1]
Impact on Shareholders' equity R$ (51,548)
Cash flow hedges [member] | Export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 7/27/2015
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  August 2018 - October 2022 
Exchange rate on designation | Numnber 3.3557
Designated amounts R$ 30,000
Amortized part (18,000)
Effect on Result (13,760) [1]
Impact on Shareholders' equity R$ (22,092)
Cash flow hedges [member] | Export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 7/28/2015
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  August 2018 - October 2022 
Exchange rate on designation | Numnber 3.3815
Designated amounts R$ 30,000
Amortized part (18,000)
Effect on Result (13,605) [1]
Impact on Shareholders' equity R$ (21,782)
Cash flow hedges [member] | Export Prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 3/8/2015
Hedging instrument Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  July 2018 - October 2022 
Exchange rate on designation | Numnber 3.394
Designated amounts R$ 355,000
Amortized part (276,500)
Effect on Result (338,777) [1]
Impact on Shareholders' equity R$ (141,512)
Cash flow hedges [member] | Bonds [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 2/4/2018
Hedging instrument Bonds
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  July 2018 - February 2023 
Exchange rate on designation | Numnber 3.3104
Designated amounts R$ 1,170,045
Amortized part (820,045)
Effect on Result (306,189) [1]
Impact on Shareholders' equity R$ (660,205)
Cash flow hedges [member] | Bonds and export prepayments in us$ [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 7/31/2019
Hedging instrument Bonds and Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  January 2020 - April 2026 
Exchange rate on designation | Numnber 3.7649
Designated amounts R$ 1,342,761
Amortized part (247,061)
Effect on Result (329,966) [1]
Impact on Shareholders' equity R$ (1,568,823)
Cash flow hedges [member] | Bonds without express maturity and export prepayments in us$ to third parties [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 10/1/2020
Hedging instrument Bonds without express maturity and Export prepayments in US$ to third parties
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  March 2020 - December 2050 
Exchange rate on designation | Numnber 4.0745
Designated amounts R$ 1,416,000
Amortized part (102,000)
Effect on Result (136,029) [1]
Impact on Shareholders' equity R$ (1,474,571)
Cash flow hedges [member] | Bond [member]  
Disclosure of detailed information about financial instruments [line items]  
Designation date 1/28/2020
Hedging instrument Bonds
Hedged item Part of the highly probable future monthly iron ore exports
Type of hedged risk Foreign exchange - R$ vs. US$ spot rate
Hedged period  March 2017 - January 2028 
Exchange rate on designation | Numnber 4.2064
Designated amounts R$ 1,000,000
Amortized part
Effect on Result [1]
Impact on Shareholders' equity R$ (990,299)
[1] On December 31, 2020, the amount of (R$1,667,886) was recorded in Other Operating Expenses. As of December 31, 2019, (R$790,353).