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Acquisitions and divestitures - Results of discontinued operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Discontinued operations      
Net operating revenue $ 40,018 $ 37,570 $ 36,696
Financial results, net (4,811) (3,413) (4,957)
Income (loss) before income taxes $ 4,969 $ (2,775) 6,816
Loss from discontinued operations     (92)
Loss from discontinued operations attributable to Vale's stockholders     (92)
Discontinued operations      
Discontinued operations      
Net operating revenue     121
Cost of goods sold and services rendered     (120)
Operating expenses     (4)
Impairment     (124)
Operating loss     (127)
Financial results, net     (5)
Income (loss) before income taxes     (132)
Income taxes     40
Loss from discontinued operations     (92)
Loss from discontinued operations attributable to Vale's stockholders     $ (92)