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Income taxes (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current taxes:      
Current taxes € 9,891 € 4,205 € 1,800
Net deferred taxes:      
Net deferred taxes (1,803) 640 850
Income tax expense 8,088 4,845 2,650
Effect of additional Corporate Tax 1,971    
Italy      
Current taxes:      
Current taxes 1,920 439 199
Net deferred taxes:      
Net deferred taxes (2,191) (45) 672
Foreign current income tax expense 69    
Extraordinary contribution tax enacted 1,036    
Germany      
Net deferred taxes:      
Extraordinary contribution tax enacted 163    
Exploration & Production | Foreign (outside Italy)      
Current taxes:      
Current taxes 7,027 3,609 1,517
Net deferred taxes:      
Net deferred taxes 713 552 73
Other segments | Foreign (outside Italy)      
Current taxes:      
Current taxes 944 157 84
Net deferred taxes:      
Net deferred taxes € (325) € 133 € 105