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Shareholders' equity and share-based payments - Number of shares (Details)
€ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
shareholder
shares
Dec. 31, 2022
EUR (€)
shareholder
€ / shares
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Shareholders' equity and share-based payments        
Share capital $ 8,163 € 6,547,828,212.50 $ 8,224 $ 8,267
Number of shares issued 2,619,131,285 2,619,131,285    
Common share par value (in Euros per shares) | € / shares   € 2.50    
Number of categories of shares | shareholder 1 1    
Authorized share capital (in shares) 3,664,966,081 3,664,966,081 3,686,636,841 3,668,371,962
Common shares        
Shareholders' equity and share-based payments        
Minimum holding period of shares to earn double voting rights 2 years      
Shareholder maximum voting rights (as a percent) 10.00% 10.00%    
Shareholder maximum double voting rights (as a percent) 20.00% 20.00%    
Minimum ownership percentage for which voting restrictions do not apply 66.67% 66.67%