XML 88 R75.htm IDEA: XBRL DOCUMENT v3.21.1
Income taxes (Narrative) (Details)
R$ in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Effective tax rate 31.24% 31.24% 31.24% 58.21% 58.21% 17.92%
Amount of tax payments and expenses increase (decrease)   $ 554,400   $ 2,323,700    
GV do Brasil Industria e Comercio of Aco LTDA [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Tax losses   985,000   $ 1,025,000    
Companhia Siderurgica do Espirito Santo S.A. [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Tax losses   $ 94        
USD [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Tax losses $ 7,832,647          
Brazil, Brazil Real [Member] | GV do Brasil Industria e Comercio of Aco LTDA [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Tax losses | R$     R$ 203,346   R$ 210,525  
Brazil, Brazil Real [Member] | Companhia Siderurgica do Espirito Santo S.A. [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Tax losses | R$     R$ 6,082      
Mexican companies [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Effective tax rate 30.00% 30.00% 30.00% 30.00% 30.00%  
Amount of tax payments and expenses increase (decrease)   $ 554,435   $ 2,323,662    
Republic [Member] | USD [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Tax losses $ 281,000          
Expiration period expire between 2033 and 2038 expire between 2033 and 2038 expire between 2033 and 2038      
Defined [Member] | USD [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Tax losses $ 200,300          
Expiration period expire between 2033 and 2038 expire between 2033 and 2038 expire between 2033 and 2038      
Undefined [Member] | USD [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Tax losses $ 80,700          
State and local [Member] | USD [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Tax losses $ 313,600          
Expiration period expire between 2021 and 2040 expire between 2021 and 2040 expire between 2021 and 2040      
Canada [Member] | USD [Member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Tax losses $ 6,100          
Expiration period expire between 2032 and 2040 expire between 2032 and 2040 expire between 2032 and 2040