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Acquisitions and divestitures - Acquisition of non-controlling interest in Vale Moambique (Details) - Vale Mocambique
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Disclosure of detailed information about business combination [line items]  
Percentage of voting capital acquired 15.00%
Loss due to negative reserves $ 331
Ownership interest in subsidiary (as a percent) 95.00%