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Intangibles - Early extension of railway concessions (Details)
R$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2020
BRL (R$)
project
item
Dec. 31, 2020
BRL (R$)
km
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about intangible assets [line items]            
Related concession grants liabilities | $         $ 1,667 $ 1,791
Discount rate for estimated cost of construction 5.93% 5.93% 5.93%   5.93%  
Guarantee insurance paid     R$ 1,026 $ 197    
Additional insurance policies based on certain contractual milestones     1,000 $ 192    
Railways concessions            
Disclosure of detailed information about intangible assets [line items]            
Extension term for concessions   30 years        
Intangible asset recognized, which represents its right to use R$ 12,016 R$ 12,016 12,016   $ 2,312  
Related concession grants liabilities | $         2,312  
Railways concessions | Grants payments for the concessions            
Disclosure of detailed information about intangible assets [line items]            
Related concession grants liabilities R$ 2,818 R$ 2,818 R$ 2,818   $ 542  
Discount rate for estimated cost of construction 11.04% 11.04% 11.04%   11.04%  
Railways concessions | Construction of the Midwest Integration Railway ("FICO")            
Disclosure of detailed information about intangible assets [line items]            
Related concession grants liabilities R$ 6,789 R$ 6,789 R$ 6,789   $ 1,306  
Area of section to be constructed | km   383        
Construction period   6 years        
Discount rate for estimated cost of construction 2.59% 2.59% 2.59%   2.59%  
Railways concessions | Infrastructure program            
Disclosure of detailed information about intangible assets [line items]            
Related concession grants liabilities R$ 1,372 R$ 1,372 R$ 1,372   $ 264  
Number of separate projects | project 450          
Discount rate for estimated cost of construction 3.08% 3.08% 3.08%   3.08%  
Railways concessions | Acquisition and delivery of rails and sleepers            
Disclosure of detailed information about intangible assets [line items]            
Related concession grants liabilities R$ 1,037 R$ 1,037 R$ 1,037   $ 200  
Discount rate for estimated cost of construction 2.67% 2.67% 2.67%   2.67%  
Estrada de Ferro Carajas ("EFC") | Railways concessions | Infrastructure program            
Disclosure of detailed information about intangible assets [line items]            
Number of municipalities will get benefited | item 25          
Ferro Vitoria a Minas ("EFVM") | Railways concessions | Infrastructure program            
Disclosure of detailed information about intangible assets [line items]            
Number of municipalities will get benefited | item 33