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Shareholders' equity and share-based payments - Paid-in surplus and Reserves (Details)
€ in Millions, $ in Millions
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Shareholders' equity and share-based payments            
Paid-in surplus | € € 35,415   € 37,276   € 32,882  
Reserves            
Percentage of net income that must be transferred to legal reserve 5.00% 5.00%        
Required legal reserve as a percentage of share capital 10.00% 10.00%        
Additional corporation tax if unrestricted reserves were wholly distributed | $   $ 575   $ 607   $ 750