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Investments - Additional information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments      
Additions and subscriptions € 1,213 € 1,607  
Share of loss of equity-accounted investments 281 285  
Deduction for dividends € 2,000 1,194  
Percentage of reasonable changes in cost of capital 1.00%    
Other investments € 1,256 1,202 € 1,294
Share of profit of equity-accounted investments 1,622 2,163  
Change in the scope of consolidation (211) (1,827)  
Other changes € 607 6,220  
North Field East project (NFE)      
Investments      
Proportion of ownership interest acquired 3.125%    
Nigeria LNG Ltd      
Investments      
Other investments € 642 668  
Saudi European Petrochemical Co      
Investments      
Other investments 121 108  
Darwin LNG Pty Ltd      
Investments      
Other investments € 78 € 71  
QatarEnergy LNG NFE (5) [member] | North Field East project (NFE)      
Investments      
Proportion of ownership interest acquired 12.50%    
Novamont group      
Investments      
Change in the scope of consolidation € 227    
Snam Group [Member] | SeaCorridor Srl      
Investments      
Proportion of ownership interest in joint venture   50.10%  
Equity interest disposed (as a percent) 49.90%    
Associates | QatarEnergy LNG NFE (5) [member]      
Investments      
Additions and subscriptions € 154    
Proportion of ownership interest acquired 25.00%    
Associates | Abu Dhabi Oil Refining Co (Takreer)      
Investments      
Deduction for dividends € 277    
Share of profit of equity-accounted investments 296    
Associates | Var Energi ASA      
Investments      
Deduction for dividends 640    
Share of profit of equity-accounted investments 356    
Difference amount between market capitalization of investee and book value of corresponding fraction of net equity 4,058    
Associates | ADNOC Global Trading Ltd      
Investments      
Deduction for dividends 129    
Share of profit of equity-accounted investments 120    
Associates | Coral FLNG SA      
Investments      
Share of loss of equity-accounted investments € 40    
Joint ventures | SeaCorridor Srl      
Investments      
Proportion of ownership interest in joint venture 50.10%    
Deduction for dividends € 95    
Share of profit of equity-accounted investments 49    
Other changes 580    
Capital gains from the fair value measurement of the business combination 414    
Joint ventures | Saipem SpA      
Investments      
Share of profit of equity-accounted investments 56    
Difference amount between market capitalization of investee and book value of corresponding fraction of net equity 193    
Joint ventures | Mozambique Rovuma Venture SpA      
Investments      
Share of profit of equity-accounted investments € 47    
Joint ventures | Doggerbank Offshore Wind Farm Project 3 Holdco Ltd      
Investments      
Proportion of ownership interest acquired 20.00%    
Joint ventures | Vårgrønn AS      
Investments      
Additions and subscriptions € 42    
Share of loss of equity-accounted investments € 50    
Proportion of ownership interest in joint venture 65.00%    
Joint ventures | Azule Energy Holdings Ltd      
Investments      
Deduction for dividends € 829    
Share of profit of equity-accounted investments 653    
Joint ventures | St. Bernard Renewables Llc      
Investments      
Additions and subscriptions € 882    
Proportion of ownership interest acquired 50.00%    
Share of loss of equity-accounted investments € 42