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Liabilities related to associates and joint ventures - Additional Information (Details)
$ in Millions, R$ in Billions
 1 Months Ended 12 Months Ended
Oct. 31, 2020
BRL (R$)
Oct. 31, 2020
USD ($)
Sep. 30, 2019
employee
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2020
USD ($)
Framework agreement              
Equity results and other results in associates and joint ventures       $ (1,063) $ (681) $ (182)  
Public civil claim filed by the Federal Government and others              
Framework agreement              
Continuance of public civil action due to deadlock in hiring of Technical Assistants R$ 155 $ 27,500          
Class action lawsuits related to Vale's American Depositary Receipts              
Framework agreement              
Amount agreed to be paid by the defendants             $ 25
Samarco              
Framework agreement              
Proceeds from debt used for working capital       166 102    
Short-term facilities available for operations       85      
Equity results and other results in associates and joint ventures       17 $ 109    
De-characterization of Germano dam              
Framework agreement              
Provision       $ 26      
Percentage of additional provision to carry out the project       50.00%      
Renova Foundation              
Framework agreement              
Number of repair and compensation programs       42      
Provision       $ 1,069      
Dam failure of Samarco | Samarco              
Framework agreement              
Number of employees in criminal proceedings | employee     1