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Investments - Market value of investments listed in regulated stock markets (Details) - EUR (€)
€ / shares in Units, € in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments      
Book value € 14,150 € 12,630 € 12,092
Ithaca Energy Plc | Ordinary shares      
Investments      
Number of ordinary shares held 614,678,516    
% of the investment in associate 37.17%    
Share price € 1.331    
Market value of associate € 818    
Book value 725    
Market value vs Book value of associate 93    
Joint ventures      
Investments      
Book value € 9,449 € 8,250  
Joint ventures | Saipem SpA      
Investments      
% of the investment in joint venture 21.61% 31.20%  
Book value € 528 € 722  
Joint ventures | Saipem SpA | Ordinary shares      
Investments      
Number of ordinary shares held 422,920,192    
% of the investment in joint venture 21.61%    
Share price € 2.509    
Market value of joint venture € 1,061    
Book value 528    
Market value vs Book value of joint venture 533    
Associates      
Investments      
Book value € 4,619 € 4,327  
Associates | Var Energi ASA      
Investments      
% of the investment in associate 63.04% 63.04%  
Book value   € 447  
Associates | Var Energi ASA | Ordinary shares      
Investments      
Number of ordinary shares held 1,573,713,749    
% of the investment in associate 63.04%    
Share price € 2.994    
Market value of associate € 4,712    
Market value vs Book value of associate € 4,712    
Associates | Ithaca Energy Plc      
Investments      
% of the investment in associate 37.17%    
Book value € 725