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Shareholders' equity and share-based payments - Number of shares (Details)
€ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
EUR (€)
item
€ / shares
shares
Dec. 31, 2019
USD ($)
item
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
shares
Shareholders' equity          
Number of categories of shares | item 1 1      
Authorized share capital (in shares) 3,593,399,547 3,593,399,547 3,669,077,772 3,434,245,369  
Share capital € 6,504,702,687.50 $ 8,123 $ 8,227 $ 7,882  
Number of shares issued 2,601,881,075 2,601,881,075      
Common shares          
Shareholders' equity          
Common share par value (in Euros per shares) | € / shares € 2.50        
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%      
Number of shares issued     2,640,602,007 2,528,989,616 2,430,365,862