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Stockholders' equity - Share capital (Details)
$ in Millions
Dec. 31, 2020
USD ($)
shares
Stockholders' equity  
Shares outstanding 5,129,910,954
Shares in treasury 154,563,828
Total issued shares 5,284,474,782
Share capital per class of shares (in millions) | $ $ 61,614
Shareholders with more than 5% of total capital  
Stockholders' equity  
Shares outstanding 1,940,863,859
Litela  
Stockholders' equity  
Shares outstanding 519,733,209
Capital World Investors  
Stockholders' equity  
Shares outstanding 298,099,389
Bradespar S.A.  
Stockholders' equity  
Shares outstanding 293,907,266
Mitsui & Co., Ltd  
Stockholders' equity  
Shares outstanding 286,347,055
Blackrock, Inc  
Stockholders' equity  
Shares outstanding 272,614,219
Capital Research Global Investors  
Stockholders' equity  
Shares outstanding 270,162,721
Non-Brazilian investors  
Stockholders' equity  
Shares outstanding 1,887,304,559
Brazilian Investors  
Stockholders' equity  
Shares outstanding 1,301,742,524
Golden shares  
Stockholders' equity  
Shares outstanding 12
Common share  
Stockholders' equity  
Shares outstanding 5,129,910,942
Shares in treasury 154,563,828
Total issued shares 5,284,474,770
Common share | Shareholders with more than 5% of total capital  
Stockholders' equity  
Shares outstanding 1,940,863,859
Common share | Litela  
Stockholders' equity  
Shares outstanding 519,733,209
Common share | Capital World Investors  
Stockholders' equity  
Shares outstanding 298,099,389
Common share | Bradespar S.A.  
Stockholders' equity  
Shares outstanding 293,907,266
Common share | Mitsui & Co., Ltd  
Stockholders' equity  
Shares outstanding 286,347,055
Common share | Blackrock, Inc  
Stockholders' equity  
Shares outstanding 272,614,219
Common share | Capital Research Global Investors  
Stockholders' equity  
Shares outstanding 270,162,721
Common share | Non-Brazilian investors  
Stockholders' equity  
Shares outstanding 1,887,304,559
Common share | Brazilian Investors  
Stockholders' equity  
Shares outstanding 1,301,742,524
Preferred share  
Stockholders' equity  
Shares outstanding 12
Total issued shares 12
Preferred share | Golden shares  
Stockholders' equity  
Shares outstanding 12