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Stockholders' equity - Share capital (Details)
$ in Millions
Dec. 31, 2021
USD ($)
shares
Stockholders' equity  
Shares outstanding 4,839,616,936
Shares in treasury 292,841,474
Total issued shares 5,132,458,410
Share capital per class of shares (in millions) | $ $ 61,614
Shareholders with more than 5% of total capital  
Stockholders' equity  
Shares outstanding 1,910,844,005
previ  
Stockholders' equity  
Shares outstanding 415,794,956
Capital World Investors  
Stockholders' equity  
Shares outstanding 335,249,101
Capital Research Global Investors  
Stockholders' equity  
Shares outstanding 326,001,911
Mitsui & Co., Ltd ("Mitsui")  
Stockholders' equity  
Shares outstanding 286,347,055
Blackrock, Inc  
Stockholders' equity  
Shares outstanding 279,562,772
Capital International Investors  
Stockholders' equity  
Shares outstanding 267,888,210
Others.  
Stockholders' equity  
Shares outstanding 2,928,772,919
Golden shares  
Stockholders' equity  
Shares outstanding 12
Common share  
Stockholders' equity  
Shares outstanding 4,839,616,924
Shares in treasury 292,841,474
Total issued shares 5,132,458,398
Common share | Shareholders with more than 5% of total capital  
Stockholders' equity  
Shares outstanding 1,910,844,005
Common share | previ  
Stockholders' equity  
Shares outstanding 415,794,956
Common share | Capital World Investors  
Stockholders' equity  
Shares outstanding 335,249,101
Common share | Capital Research Global Investors  
Stockholders' equity  
Shares outstanding 326,001,911
Common share | Mitsui & Co., Ltd ("Mitsui")  
Stockholders' equity  
Shares outstanding 286,347,055
Common share | Blackrock, Inc  
Stockholders' equity  
Shares outstanding 279,562,772
Common share | Capital International Investors  
Stockholders' equity  
Shares outstanding 267,888,210
Common share | Others.  
Stockholders' equity  
Shares outstanding 2,928,772,919
Preferred share  
Stockholders' equity  
Shares outstanding 12
Total issued shares 12
Preferred share | Golden shares  
Stockholders' equity  
Shares outstanding 12