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Shareholders' equity and share-based payments - Paid-in surplus and Reserves (Details)
€ in Millions, $ in Millions
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
USD ($)
Shareholders' equity and share-based payments            
Paid-in surplus | € € 23,345   € 24,385   € 35,099  
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 | $   $ 234   $ 234   $ 227