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Acquisitions and divestitures - Vale Nouvelle-Caldonie S.A.S. (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Disclosure of associates [line items]      
Gain (Loss) arising from the accumulated exchange differences reclassified from the stockholders' equity to the income statement   $ 1,132  
VNC      
Disclosure of associates [line items]      
Amount of liability that will be recognized at completion of transaction     $ 500
Increase in amount of liability that will be recognized at completion of transaction $ 55    
Additional loss recorded as impairment and disposals of non-current assets 98    
Cash consideration from divestment of shares in associate $ 555    
Annual nickel production term   13 years  
Gain (Loss) arising from the accumulated exchange differences reclassified from the stockholders' equity to the income statement   $ 1,132