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Impairment reversal (impairment and disposals) of non-current assets (Details) - USD ($) $ in Millions | 12 Months Ended
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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)

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