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Impairment reversal (impairment and disposals) of non-current assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Midwestern System [Member]      
IfrsStatementLineItems [Line Items]      
Reversal of impairment loss $ 205 $ (78)
Manganese [Member]      
IfrsStatementLineItems [Line Items]      
Reversal of impairment loss (10) (35) (76)
Vale Nouvelle Caledonie S. A. S [Member]      
IfrsStatementLineItems [Line Items]      
Reversal of impairment loss (98) (882)
Biopalma [Member]      
IfrsStatementLineItems [Line Items]      
Reversal of impairment loss (125)
Impairment Reversal Of Noncurrent Assets [Member]      
IfrsStatementLineItems [Line Items]      
Reversal of impairment loss 195 (211) (1,083)
Onerous Contracts Midwestern System [Member]      
IfrsStatementLineItems [Line Items]      
Reversal of impairment loss 916 (18)
Result Disposals Non Current Assets [Member]      
IfrsStatementLineItems [Line Items]      
Reversal of impairment loss (338) (197) (225)
Result Disposals Non Current Assets Other Results [Member]      
IfrsStatementLineItems [Line Items]      
Reversal of impairment loss 578 (215) (225)
Impairment Reversal Disposals Non Current Assets [Member]      
IfrsStatementLineItems [Line Items]      
Reversal of impairment loss $ 773 $ (426) $ (1,308)