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15. OTHER PAYABLES (Details Narrative) - CSN mineracao [member]
R$ in Thousands, $ in Thousands
 12 Months Ended
Aug. 28, 2020
USD ($)
Jul. 31, 2020
T
Dec. 31, 2020
Dec. 31, 2019
T
Aug. 28, 2020
BRL (R$)
Aug. 05, 2019
USD ($)
Aug. 05, 2019
BRL (R$)
Mar. 29, 2019
USD ($)
Mar. 29, 2019
BRL (R$)
OtherPayablesLineItems [Line Items]                  
Supply of iron ore       22,000,000          
Additional supply of iron ore   4,000,000   11,000,000          
Advances from customer | R$         R$ 629,000   R$ 956,440   R$ 1,951,303
Contractual term 3 years   5 years            
USD                  
OtherPayablesLineItems [Line Items]                  
Advances from customer | $ $ 115,000         $ 250,000   $ 496,000