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Income (expense) from investments - Additional information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other gain (loss) from investments      
Dividend income € 255 € 351 € 230
Capital gain realized from the sale of investments 430 483 1
Capital gain from the fair value measurement of the residual stake of investments held 414    
Nigeria LNG Ltd      
Other gain (loss) from investments      
Dividend income 179 247 144
Saudi European Petrochemical Co      
Other gain (loss) from investments      
Dividend income 55 77 € 54
Var Energi ASA      
Other gain (loss) from investments      
Capital gains realized from listing on Stock Exchange   448  
Azule Energy Holdings Ltd      
Other gain (loss) from investments      
Capital gains from the fair value measurement of the business combination   2,542  
Realized exchange differences on translation from the business combination   764  
SeaCorridor Srl | Snam Group [Member]      
Other gain (loss) from investments      
Capital gain realized from the sale of investments € 420    
Equity interest disposed (as a percent) 49.90%    
Realized exchange differences on translation from the disposal of investments € 7    
Capital gain from the fair value measurement of the residual stake of investments held   € 414  
Proportion of ownership interest in joint venture (as a percent)   50.10%