v3.26.1
Costs - Additional information (Details)
€ / shares in Units, € in Millions
12 Months Ended
Dec. 31, 2025
EUR (€)
shares
NUMBER
€ / shares
Dec. 31, 2024
EUR (€)
shares
Dec. 31, 2023
EUR (€)
May 15, 2024
NUMBER
Costs        
Research and development costs € 207.0 € 178.0 € 166.0  
Royalty expense 984.0 1,122.0 1,138.0  
Net additions for contingencies 1,117.0 1,397.0 1,369.0  
Provisions for redundancy incentives expense 70.0 66.0 56.0  
Defined contribution plans expense € 110.0 104.0 102.0  
Performance period 3 years      
Number of other equity instruments granted in share-based payment arrangement | shares 5.78      
Weighted average fair value of awarded shares | € / shares € 10.6      
Directors' remuneration expense € 11.8 12.9 13.9  
Statutory auditors remuneration expense € 0.5 0.5 0.6  
Minimum        
Costs        
Percentage of shares that will vest after vesting period 0.00%      
Maximum        
Costs        
Percentage of shares that will vest after vesting period 180.00%      
Long-Term Monetary Incentive Plans        
Costs        
Number of share-based plans | NUMBER 2      
Number of annual awards | NUMBER 3      
Vesting period 3 years      
Expense from share-based payment transactions with employees € 20.0 23.0 20.0  
Long-Term Monetary Incentive Plan 2020 - 2022 | Maximum        
Costs        
Limit of shares to be granted in share-based payment arrangement | shares 20,000,000      
Long-Term Monetary Incentive Plan 2023 - 2025 | Maximum        
Costs        
Limit of shares to be granted in share-based payment arrangement | shares 16,000,000      
Employee Stock Ownership Plan        
Costs        
Number of annual awards | NUMBER       3
Expense from share-based payment transactions with employees € 15.0 € 1.0    
Lock-up clause term 3 years      
Number of other equity instruments granted in share-based payment arrangement | shares 3,289,345 3,102,700    
Environmental liabilities        
Costs        
Net additions for contingencies € 559.0 € 848.0 559.0  
Provisions for decommissioning of depleted oil and gas assets        
Costs        
Net additions for contingencies (9.0) 300.0 305.0  
Provisions for litigations        
Costs        
Net additions for contingencies 268.0 40.0 (87.0)  
Exploration & Production        
Costs        
Prospecting costs, geological and geophysical studies of exploration activities € 174.0 € 186.0 € 205.0