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Shareholders' equity and share-based payments - Number of shares (Details)
€ / shares in Units, $ in Millions
Dec. 31, 2023
USD ($)
shareholder
shares
Dec. 31, 2023
EUR (€)
shareholder
€ / shares
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Shareholders' equity        
Share capital $ 7,616 € 6,030,629,587.50 $ 8,163 $ 8,224
Number of shares issued 2,412,251,835 2,412,251,835    
Common share par value (in Euros per shares) | € / shares   € 2.50    
Number of categories of shares | shareholder 1 1    
Authorized share capital (in shares) 3,436,374,353 3,436,374,353 3,664,966,081 3,686,636,841
Common shares        
Shareholders' equity        
Shareholder maximum voting rights (as a percent) 10.00% 10.00%    
Minimum ownership percentage for which voting restrictions do not apply 66.67% 66.67%