v3.26.1
Investments - Market value of investments listed in regulated stock markets (Details) - EUR (€)
€ / shares in Units, € in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Investments      
Book value € 13,155 € 14,150 € 12,630
Joint ventures      
Investments      
Book value € 9,016 € 9,449  
Joint ventures | Saipem SpA      
Investments      
% of the investment in joint venture 21.80% 21.61%  
Book value € 581 € 528  
Joint ventures | Saipem SpA | Ordinary shares      
Investments      
Number of ordinary shares held 422,920,192    
% of the investment in joint venture 21.80%    
Share price € 2.425    
Market value of joint venture € 1,025    
Book value 581    
Market value vs Book value of joint venture 444    
Associates      
Investments      
Book value € 4,047 € 4,619  
Associates | Var Energi ASA      
Investments      
% of the investment in associate 63.04% 63.04%  
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 € 2.787    
Market value of associate € 4,386    
Market value vs Book value of associate € 4,386    
Associates | Ithaca Energy Plc      
Investments      
% of the investment in associate 35.92% 37.17%  
Book value € 486 € 725  
Associates | Ithaca Energy Plc | Ordinary shares      
Investments      
Number of ordinary shares held 594,048,748    
% of the investment in associate 35.92%    
Share price € 1.899    
Market value of associate € 1,128    
Book value 486    
Market value vs Book value of associate € 642