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Acquisitions and divestitures - Vale Moambique (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
IfrsStatementLineItems [Line Items]        
Equity results and other results in associates and joint ventures   $ (29)   $ 157
Equity results and other results in associates and joint ventures $ (93) (29) $ (56) 157
Impairment reversal (impairment) of non-current assets gross   (30)   1,104
Impairment reversal (impairment) of non-current assets, Net   (459)   515
Companhia Siderurgica Do Pecem [Member]        
IfrsStatementLineItems [Line Items]        
Equity results and other results in associates and joint ventures   (24) 37 (135)
Mineracao Rio Do Norte [Member]        
IfrsStatementLineItems [Line Items]        
Equity results and other results in associates and joint ventures $ (93)   $ (93)  
Midwestern System [Member]        
IfrsStatementLineItems [Line Items]        
Impairment reversal (impairment) of non-current assets gross   (30)   1,104
California Steel Industries [Member]        
IfrsStatementLineItems [Line Items]        
Equity results and other results in associates and joint ventures   (5)   292
Discontinued operations [member]        
IfrsStatementLineItems [Line Items]        
Impairment reversal (impairment) of non-current assets gross   $ (429)   $ (589)