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Shareholders' equity and share-based payments - Number of shares (Details)
€ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
item
shares
Dec. 31, 2020
EUR (€)
item
€ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Shareholders' equity        
Share capital $ 8,267 € 6,632,810,062.50 $ 8,123 $ 8,227
Number of shares issued 2,653,124,025 2,653,124,025    
Common share par value (in Euros per shares) | € / shares   € 2.50    
Number of categories of shares | item 1 1    
Authorized share capital (in shares) 3,668,371,962 3,668,371,962 3,593,399,547 3,669,077,772
Common shares        
Shareholders' equity        
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%