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Reversals (Impairments) of tangible and intangible assets and right-of-use assets. Sensitivity of outcomes to alternative scenarios - Additional Information (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Impairment review of tangible and intangible assets and right-of-use assets      
Risk-adjusted weighted average cost of capital (adjusted WACC) (in percent) 7.00%    
Net impairment losses € 1,802,000 € 1,140,000 € 167,000
Percentage by which headroom is higher than book value 80.00%    
Book value of refineries € 0    
Alaska, Gulf of Mexico, Turkmenistan, Italy and Australia      
Impairment review of tangible and intangible assets and right-of-use assets      
Net impairment losses € 1,000,000    
Italy      
Impairment review of tangible and intangible assets and right-of-use assets      
Risk-adjusted pre-tax WACC 5.10%    
ALASKA      
Impairment review of tangible and intangible assets and right-of-use assets      
Risk-adjusted pre-tax WACC 20.30%    
Chemicals      
Impairment review of tangible and intangible assets and right-of-use assets      
Property, plant and equipment, residual value € 581,000    
Gas power generation      
Impairment review of tangible and intangible assets and right-of-use assets      
Property, plant and equipment, residual value € 766,000    
Minimum      
Impairment review of tangible and intangible assets and right-of-use assets      
Post-tax, risk-adjusted WACC (in percent) 6.00%    
Maximum      
Impairment review of tangible and intangible assets and right-of-use assets      
Post-tax, risk-adjusted WACC (in percent) 7.50%