v3.26.1
Impairments of tangible and intangible assets and right-of-use assets. Sensitivity of outcomes to decarbonization scenarios - Additional Information (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2025
EUR (€)
$ / bbl
$ / MMBTU
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Impairment review of tangible and intangible assets and right-of-use assets      
Risk-adjusted weighted average cost of capital (adjusted WACC) (in percent) 6.00%    
Net impairment losses | € € 1,582 € 2,900 € 1,802
Post-tax, risk-adjusted WACC (in percent) 6.00%    
Book value of biorefinery assets | € € 2,711    
Average Brent breakeven price (in dollors per barrel) | $ / bbl 35    
Projected percentage decreases in hydrocarbon prices, over duration of cash flows projections (10.00%)    
Projected percentage point increases in the discount rate of future cash flows 100.00%    
Assumption period of decommissioning and asset retirement obligations for provision of energy transition risk 5 years    
Estimated provision of energy transition risk | € € 1,200    
Minimum      
Impairment review of tangible and intangible assets and right-of-use assets      
Risk-adjusted pre-tax WACC 9.00%    
Discount rate used for the valuation of asset retirement obligation 2.00%    
Estimated currency inflation rate 2.00%    
Maximum      
Impairment review of tangible and intangible assets and right-of-use assets      
Risk-adjusted pre-tax WACC 15.00%    
Discount rate used for the valuation of asset retirement obligation 5.20%    
Estimated currency inflation rate 2.40%    
2026      
Impairment review of tangible and intangible assets and right-of-use assets      
Long-term price of the Brent crude oil benchmark | $ / bbl 68    
Long-term gas price | $ / MMBTU 11.8    
2050      
Impairment review of tangible and intangible assets and right-of-use assets      
Long-term price of the Brent crude oil benchmark | $ / bbl 53    
2030      
Impairment review of tangible and intangible assets and right-of-use assets      
Long-term price of the Brent crude oil benchmark | $ / bbl 75    
Beyond 2030      
Impairment review of tangible and intangible assets and right-of-use assets      
Projected percentage of linear decline per year 1.70%    
2040      
Impairment review of tangible and intangible assets and right-of-use assets      
Long-term price of the Brent crude oil benchmark | $ / bbl 65    
2026-2050      
Impairment review of tangible and intangible assets and right-of-use assets      
Long-term price of the Brent crude oil benchmark | $ / bbl 65    
Gas power generation      
Impairment review of tangible and intangible assets and right-of-use assets      
Property, plant and equipment, residual value | € € 887    
CGUs      
Impairment review of tangible and intangible assets and right-of-use assets      
Net impairment losses | € 564    
Versalis CGU      
Impairment review of tangible and intangible assets and right-of-use assets      
Written down of property, plant and equipment | € € 151