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Stockholders' equity - Share capital (Details)
$ in Millions
Jun. 30, 2021
USD ($)
shares
Stockholders' equity  
Shares outstanding 5,037,713,236
Shares in treasury 246,761,546
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 1,904,734,340
previ  
Stockholders' equity  
Shares outstanding 447,780,782
Capital World Investors  
Stockholders' equity  
Shares outstanding 302,201,922
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 279,562,772
Capital Research Global Investors  
Stockholders' equity  
Shares outstanding 294,934,543
Golden shares  
Stockholders' equity  
Shares outstanding 12
Total issued shares 12
Others  
Stockholders' equity  
Shares outstanding 3,132,978,884
Common share  
Stockholders' equity  
Shares outstanding 5,037,713,224
Shares in treasury 246,761,546
Total issued shares 5,284,474,770
Common share | Shareholders with more than 5% of total capital  
Stockholders' equity  
Shares outstanding 1,904,734,340
Common share | previ  
Stockholders' equity  
Shares outstanding 447,780,782
Common share | Capital World Investors  
Stockholders' equity  
Shares outstanding 302,201,922
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 279,562,772
Common share | Capital Research Global Investors  
Stockholders' equity  
Shares outstanding 294,934,543
Common share | Others  
Stockholders' equity  
Shares outstanding 3,132,978,884