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Income taxes (Details Narrative)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
BRL (R$)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2022
BRL (R$)
Dec. 31, 2021
BRL (R$)
IfrsStatementLineItems [Line Items]                
Tax incentive 10 years 10 years            
Tax assessment $ 24   $ 21       R$ 126 R$ 115
Tax effect of tax losses (197)   (115)   $ (215)      
Reduction of tax losses 829 R$ 4,324 669 R$ 3,732        
Deferred tax liabilities 361   377       1,883 1,883
Tax effect of expense not deductible in determining taxable profit (tax loss) 1,154 6,021 981 5,477        
Taxes paid 439 2,288 399 2,255        
Administrative amount 517 2,698 305 1,703        
Reduction tax loss carryforward 61 320 57 320        
Amount assessed 223 1,162            
Tax loss carryforward 5   4       R$ 24 R$ 24
Gains on litigation settlements     145 808 $ 60 R$ 313    
Additional gain | R$       146        
Vale Nouvelle Caledonie [Member]                
IfrsStatementLineItems [Line Items]                
Gains (losses) recognised when control of subsidiary is lost 34              
Uncertainty On Transfer Pricing Over Exportation Of Ores To Foreign Subsidiary [Member]                
IfrsStatementLineItems [Line Items]                
Tax assessment 3,659   3,122          
Tax effect of tax losses 564   527          
Tax effect of foreign tax rates 530 2,763 426 2,376        
Uncertainty On Expenses Of Interest On Capital [Member]                
IfrsStatementLineItems [Line Items]                
Tax effect of expense not deductible in determining taxable profit (tax loss) $ 134 R$ 699 $ 125 R$ 699