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Intangible assets - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Aug. 04, 2022
Dec. 31, 2020
Intangible assets        
Write-off € 13 € 35    
Change in the scope of consolidation 673 1,835    
Other changes 121 11    
Goodwill € 3,138 2,862    
Assets held for sale | Eni Corridor Srl        
Intangible assets        
Equity interest disposed (as a percent) 49.90%      
Plenitude        
Intangible assets        
Goodwill € 2,927 € 2,446    
Be Power        
Intangible assets        
Equity interest acquired (as a percent)   100.00%    
Aldro Energa Y Soluciones SLU        
Intangible assets        
Equity interest acquired (as a percent)   100.00%    
Finproject SpA        
Intangible assets        
Equity interest acquired (as a percent)   60.00%   40.00%
Energia Eolica Boreas SLU | Plenitude        
Intangible assets        
Equity interest acquired (as a percent)     100.00%  
CGU Domestic-Foreign Market | Retail sale of natural gas and electricity business of Plenitude        
Intangible assets        
Goodwill € 1,214      
Period over which management has projected cash flows 4 years      
Growth rate used to extrapolate cash flow projections 0.00%      
Amount by which unit's recoverable amount exceeds its carrying amount € 7,000      
CGU Domestic-Foreign Market | Retail sale of natural gas and electricity business of Plenitude | Minimum        
Intangible assets        
Discount rate 4.20%      
CGU Domestic-Foreign Market | Retail sale of natural gas and electricity business of Plenitude | Maximum        
Intangible assets        
Discount rate 4.30%      
CGU Domestic-Foreign Market | Renewables business of Plenitude        
Intangible assets        
Latest period of operations are being developed 2 years      
Amount by which unit's recoverable amount exceeds its carrying amount if one percent point increase in weighted average cost of capital (WACC) € 250      
Goodwill € 995      
Period over which management has projected cash flows 4 years      
CGU Domestic-Foreign Market | Renewables business of Plenitude | Minimum        
Intangible assets        
Discount rate 5.20%      
CGU Domestic-Foreign Market | Renewables business of Plenitude | Maximum        
Intangible assets        
Discount rate 5.80%      
CGU Domestic-Foreign Market | Be Power | E-mobility business of Plentitude        
Intangible assets        
Goodwill € 718      
Period over which management has projected cash flows 4 years      
Discount rate 10.70%      
Amount by which unit's recoverable amount exceeds its carrying amount € 1,000      
Accumulated impairment        
Intangible assets        
Goodwill (2,662)      
Intangible assets with definite useful lives        
Intangible assets        
Write-off 13 € 35    
Change in the scope of consolidation 191 237    
Other changes 185 11    
Intangible assets with definite useful lives | Definitive allocation        
Intangible assets        
Other changes 277      
Intangible assets with definite useful lives | Plenitude        
Intangible assets        
Change in the scope of consolidation 391      
Intangible assets with definite useful lives | Deconsolidated Entities        
Intangible assets        
Change in the scope of consolidation (200)      
Intangible assets with definite useful lives | PLT Energia Srl and SEF Srl | Plenitude        
Intangible assets        
Change in the scope of consolidation 217      
Intangible assets with definite useful lives | Energia Eolica Boreas SLU | Plenitude        
Intangible assets        
Change in the scope of consolidation 153      
Exploration rights        
Intangible assets        
Write-off 13 35    
Change in the scope of consolidation (200)      
Other changes (2)      
Capitalized costs for customer acquisition | Plenitude & Power        
Intangible assets        
Intangible assets other than goodwill 358 348    
Concessions, licenses, trademarks and similar items        
Intangible assets        
Intangible assets other than goodwill 692 139    
Transport rights of natural gas | Assets held for sale        
Intangible assets        
Other changes (115)      
Customer relationship        
Intangible assets        
Intangible assets other than goodwill 101 109    
Intangible assets in progress | Plenitude & Power        
Intangible assets        
Intangible assets other than goodwill 615      
Goodwill        
Intangible assets        
Change in the scope of consolidation 482 € 1,574    
Other changes (64)      
Goodwill | SKGR Energy Single Member SA        
Intangible assets        
Change in the scope of consolidation € 52      
Equity interest acquired (as a percent) 100.00%      
Goodwill | PLT Energia Srl and SEF Srl        
Intangible assets        
Change in the scope of consolidation € 412      
Equity interest acquired (as a percent) 100.00%      
Goodwill | Energia Eolica Boreas SLU        
Intangible assets        
Change in the scope of consolidation € 18      
Equity interest acquired (as a percent) 100.00%