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Significant events in the current year (Details)
R$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2020
USD ($)
Aug. 31, 2020
USD ($)
Jul. 31, 2020
BRL (R$)
Jul. 31, 2020
USD ($)
Jun. 30, 2020
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of non-adjusting events after reporting period [line items]                        
Related concession grants liabilities                   $ 1,791,000,000   $ 1,667,000,000
Impairment and disposals of non-current assets                 $ 2,243,000,000 5,074,000,000 $ 899,000,000  
Stockholders remuneration paid         R$ 18,637 $ 3,350,000,000            
Percentage of divestment of shares   8.00%                    
Cash consideration from divestment of shares in associate                       241,000,000
Percentage of total share held   29.60%                    
Loss from divestiture of shares in associate   $ 172,000,000                    
Impairment and disposal of non-current assets                 2,243,000,000 5,074,000,000 899,000,000  
Notional amount                       1,296,000,000
Guaranteed notes due July 2030                        
Disclosure of non-adjusting events after reporting period [line items]                        
Notional amount           $ 1,500,000,000           1,500.000
PTVI                        
Disclosure of non-adjusting events after reporting period [line items]                        
Percentage of divestment of shares             14.90%          
Cash consideration from divestment of shares in subsidiary     $ 278,000,000                  
Loss from divestiture of shares in subsidiary                 179,000,000      
Discontinued operations                        
Disclosure of non-adjusting events after reporting period [line items]                        
Impairment loss                     $ 124,000,000  
VLI S.A.                        
Disclosure of non-adjusting events after reporting period [line items]                        
Percentage of divestment of shares   8.00%                    
Cash consideration from divestment of shares in associate               R$ 1,223       241,000,000
Percentage of total share held   29.60%                    
Loss from divestiture of shares in associate                 172,000,000      
Vale Nouvelle Caledonie S.A.S.                        
Disclosure of non-adjusting events after reporting period [line items]                        
Amount of liability that will be recognized at completion of transaction                       500,000,000
Impairment and disposals of non-current assets                 882,000,000      
Impairment and disposal of non-current assets                 882,000,000      
Samarco                        
Disclosure of non-adjusting events after reporting period [line items]                        
Proceeds from debt used for working capital                 166,000,000 $ 102,000,000    
Ningbo Zhoushan Port                        
Disclosure of non-adjusting events after reporting period [line items]                        
Term of joint venture     3 years                  
Ningbo Zhoushan Port | Minimum                        
Disclosure of non-adjusting events after reporting period [line items]                        
Capital contribution     $ 110,000,000                  
Ningbo Zhoushan Port | Maximum                        
Disclosure of non-adjusting events after reporting period [line items]                        
Capital contribution     $ 160,000,000                  
Biopalma                        
Disclosure of non-adjusting events after reporting period [line items]                        
Gain from disposals of non-current assets                 125,000,000      
Henan Longyu                        
Disclosure of non-adjusting events after reporting period [line items]                        
Cash received from disposal of non-current assets held for sale       $ 156,000,000                
Reclassification of gain related to the cumulative translation adjustments on to income statements                 116,000,000      
Simoes Filho plant                        
Disclosure of non-adjusting events after reporting period [line items]                        
Impairment and disposals of non-current assets                 76,000,000      
Impairment and disposal of non-current assets                 76,000,000      
Renova Foundation                        
Disclosure of non-adjusting events after reporting period [line items]                        
Provision                 1,069,000,000      
Nacala Corridor                        
Disclosure of non-adjusting events after reporting period [line items]                        
Impairment of loans and receivables                 798,000,000      
Held for sale                        
Disclosure of non-adjusting events after reporting period [line items]                        
Impairment loss                 382,000,000      
Railways concessions                        
Disclosure of non-adjusting events after reporting period [line items]                        
Extension term for concessions   30 years                    
Intangible asset recognized, which represents its right to use               12,016       2,312,000,000
Related concession grants liabilities                       $ 2,312,000,000
De-characterization of upstream structures                        
Disclosure of non-adjusting events after reporting period [line items]                        
Provision recognized                 369,000,000      
De-characterization of other structures                        
Disclosure of non-adjusting events after reporting period [line items]                        
Provision recognized                 248,000,000      
Judicial Settlement for Integral Reparation                        
Disclosure of non-adjusting events after reporting period [line items]                        
Loss to repair the environmental and social damage resulting from the Dam I rupture               R$ 19,924 3,872,000,000      
Heads of Agreement | Nacala Corridor | Mitsui & Co., Ltd                        
Disclosure of non-adjusting events after reporting period [line items]                        
Outstanding balance of project finance $ 2,500,000,000               $ 2,500,000,000