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Employee benefits - Assumptions used for the Monte Carlo simulation (Details) - Performance Share Unit Program - PSU	Dec. 31, 2021 Y R$ / shares USD ($)
Granted shares
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Measurement unit | $	1,474,723
VALE (BRL)
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Measurement unit	109.02
VALE ON (USD)
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Measurement unit	20.12
Expected volatility
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Measurement unit	39.00
Expected dividend yield
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Measurement unit	3.18
Expected term (in years)
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Measurement unit | Y	3
Expected shareholder return indicator
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Measurement unit	51.20
Expected value of the performance factor (Total)
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]
Measurement unit	60.96

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2021-01-01
-Paragraph 93
-Subparagraph d
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